Exchange – Add nested group recipients to parent resources

Alex Ø. T. Hansen

19/09/2018

Exchange – Add nested group recipients to parent resources

Do you have nested groups within Exchange resources such as distribution groups, shared mailboxes, rooms or equipment?

If you have, you have come to the right place. I have created a script that extracts all nested group members of a resource, and add it directly to the resource instead.

The script works in both on-premise and Exchange Online.

Before you can run the script, you need to have access to the following:

Access to on-premise and/or Office 365 environment as a administrator.
Have the AzureAD and Active Directory PowerShell module installed.

I created the script pretty fast for a customer, so the code isn’t beautiful or fast but it works as intended!

#requires -version 3
<#
.SYNOPSIS
  Get nested group members of resources/shared mailboxes/distribution groups, and add them to parent.

.DESCRIPTION
  Loops through all members of resources/shared mailboxes/distributionlist and add them to the parent object.

.NOTES
  Version:        1.0
  Author:         Alex Ø. T. Hansen
  Creation Date:  17-09-2018
  Purpose/Change: Initial script development
#>

#region begin input
############### Input - Start ###############

#Credentials.
$ExchangeOnlineUsername = "<exchange online upn administrator>";

#Modules.
$ModuleExchangePS1 = "C:\Program Files\Microsoft\Exchange Server\V15\bin\RemoteExchange.ps1";
$ModuleExchangeOnlinePS1 = "CreateExoPSSession.ps1";
$ModuleExchangeOnlineDLL = "Microsoft.Exchange.Management.ExoPowershellModule.dll";

############### Input - End ###############
#endregion

#region begin boostrap
############### Bootstrap - Start ###############

#Import module Active Directory.
Import-Module ActiveDirectory | Out-Null;

#Import module Exchange.
. $ModuleExchangePS1;
Connect-ExchangeServer -auto -ClientApplication:ManagementShell | Out-Null;

#Import module Exchange Online.
$PSExoPowershellModuleRoot = (Get-ChildItem -Path $env:userprofile -Filter $ModuleExchangeOnlinePS1 -Recurse -ErrorAction SilentlyContinue -Force | Select -Last 1).DirectoryName;
$ExoPowershellModule = $ModuleExchangeOnlineDLL;
$ExoModulePath = [System.IO.Path]::Combine($PSExoPowershellModuleRoot, $ExoPowershellModule);
Import-Module $ExoModulePath;
$SessionExchangeOnline = New-ExoPSSession -UserPrincipalName $ExchangeOnlineUsername;
Import-PSSession $SessionExchangeOnline -Prefix Online | Out-Null;

#Import Azure AD.
Connect-AzureAD;

#Clear screen.
Clear-Host;

############### Bootstrap - End ###############
#endregion

#region begin functions
############### Functions - Start ###############

#Get nested Azure groups.
Function Get-AzureADNestedGroups
{
    [cmdletbinding()]

    Param
    (
        [Parameter(Mandatory=$true, HelpMessage="Please provide a valid identity.")]$ObjectId
    )

    #Get all groups/users of the root group.
    $Members = Get-AzureADGroupMember -ObjectId $ObjectId;

    #Foreach member in the group.
    Foreach($Member in $Members)
    {
        #If the member is a group.
        If($Member.ObjectType -eq "Group")
        {
            #Run the function again against the group.
            $Users += (Get-AzureADNestedGroups -ObjectId $Member.ObjectId);
        }

        #If the user is a user.
        If($Member.UserType -eq "Member")
        {
            #If the user isn't in the array.
            If($Member.Mail -notin $Users)
            {
                #Add the user to the object array.
                $Users += @($Member.Mail);
            }
        }
    }

    #Return the users
    Return ,$Users;
}

#Get nested AD groups.
Function Get-ADNestedGroups
{
    [cmdletbinding()]

    Param
    (
        [Parameter(Mandatory=$true, HelpMessage="Please provide a valid identity.")]$Identity
    )

    #Get all groups/users of the root group.
    $Members = Get-ADGroupMember -Identity $Identity;

    #Foreach member in the group.
    Foreach($Member in $Members)
    {
        #If the member is a group.
        If($Member.ObjectClass -eq "group")
        {
            #Run the function again against the group.
            $Users += Get-ADNestedGroups -Identity $Member.distinguishedName;
        }
        Else
        {
            #Clear variable.
            $Mail = $null;

            #Get member primary e-mail address.
            If($Mail = (Get-ADobject -Identity $Member.distinguishedName -Properties mail).mail)
            {
                #Add the user to the object array.
                $Users += @($Mail);   
            }
        }
    }

    #Return the users
    Return ,$Users;
}

############### Functions - End ###############
#endregion

#region begin main
############### Main - Start ###############

#Get shared mailboxes from on-prem and Office 365.
Write-Output("On-premise: Getting all shared mailboxes.");
$ExchangeSharedMailboxes = (Get-Mailbox -RecipientTypeDetails SharedMailbox -ResultSize Unlimited);
Write-Output("Office 365: Getting all shared mailboxes.");
$ExchangeOnlineSharedMailboxes = (Get-OnlineMailbox -RecipientTypeDetails SharedMailbox -ResultSize Unlimited);

#Get resources from on-prem and Office 365.
Write-Output("On-premise: Getting all resources.");
$ExchangeResources = (Get-Mailbox -Filter "RecipientTypeDetails -eq 'RoomMailbox' -or RecipientTypeDetails -eq 'EquipmentMailbox'" -ResultSize Unlimited);
Write-Output("Office 365: Getting all resources.");
$ExchangeOnlineResources = (Get-OnlineMailbox -Filter "RecipientTypeDetails -eq 'RoomMailbox' -or RecipientTypeDetails -eq 'EquipmentMailbox'" -ResultSize Unlimited);

#Get distributiongroups from on-prem and Office 365.
Write-Output("On-premise: Getting all distributiongroups.");
$ExchangeDistributionsgroups = (Get-DistributionGroup -Filter "RecipientTypeDetails -eq 'MailUniversalDistributionGroup' -or RecipientTypeDetails -eq 'MailUniversalSecurityGroup'" -ResultSize Unlimited);
Write-Output("Office 365: Getting all distributiongroups.");
$ExchangeOnlineDistributionsgroups = (Get-OnlineDistributionGroup -Filter "RecipientTypeDetails -eq 'MailUniversalDistributionGroup' -or RecipientTypeDetails -eq 'MailUniversalSecurityGroup'" -ResultSize Unlimited);

#Get recipients from on-prem and Office 365.
Write-Output("On-premise: Getting all recipients.");
$ExchangeRecipients = Get-Recipient -ResultSize Unlimited;
Write-Output("Office 365: Getting all recipients.");
$ExchangeOnlineRecipients = Get-OnlineRecipient -ResultSize Unlimited;

#Object array.
$SharedMailboxes = @();
$Resources = @();
$DistributionGroups = @();

Write-Output("");
Write-Output("##### Shared Mailbox - Full Access #####");

#Exchange Online - Shared Mailboxes - Full Access.
Foreach($ExchangeOnlineSharedMailbox in $ExchangeOnlineSharedMailboxes)
{
    #Clear variables.
    $Members = $null;

    Write-Output($ExchangeOnlineSharedMailbox.Name + ": Getting all identities with 'FullAccess'.");

    #Get mailbox permissions.
    $Identities = $ExchangeOnlineSharedMailbox | Get-OnlineMailboxPermission | Where-Object {$_.User -notlike "*NT AUTHORITY*" -and $_.AccessRights -eq "FullAccess"};

    #Foreach full access permission.
    Foreach($Identity in $Identities)
    {
        #Clear variables.
        $Group = $null;
        $User = $null;
        
        #If the recepient is a user.
        If($User = $ExchangeOnlineRecipients | Where-Object {$_.PrimarySmtpAddress -eq $Identity.User})
        {
            Write-Output($ExchangeOnlineSharedMailbox.Name + ": '" + $Identity.User + "' is a user, and have the 'Full Acess' permission.");

            #Add address to array.
            $Members += @($User.PrimarySmtpAddress);
        }
        ElseIf($Group = Get-AzureADGroup -SearchString $Identity.User)
        {
            Write-Output($ExchangeOnlineSharedMailbox.Name + ": '" + $Identity.User + "' is a group and have the 'Full Acess' permission, getting nested groups.");

            #Add address to array.
            $Members += (Get-AzureADNestedGroups -ObjectId $Group.ObjectId);
        }
    }

    #Create new object.
    $SharedMailbox = New-Object –TypeName PSObject;

    #Add property to object.
    Add-Member -InputObject $SharedMailbox –MemberType NoteProperty –Name Mailbox –Value $ExchangeOnlineSharedMailbox.Name;
    Add-Member -InputObject $SharedMailbox –MemberType NoteProperty –Name PrimarySmtpAddress –Value $ExchangeOnlineSharedMailbox.PrimarySmtpAddress;
    Add-Member -InputObject $SharedMailbox –MemberType NoteProperty –Name Placement –Value "Office365";
    Add-Member -InputObject $SharedMailbox –MemberType NoteProperty –Name Access –Value "FullAccess";
    Add-Member -InputObject $SharedMailbox –MemberType NoteProperty –Name Members –Value $Members;

    #Add to object array..
    $SharedMailboxes += $SharedMailbox;

    Write-Output ("");
}

Write-Output("##### Shared Mailbox - Send As #####");

#Exchange Online - Shared Mailboxes - Send As.
Foreach($ExchangeOnlineSharedMailbox in $ExchangeOnlineSharedMailboxes)
{
    #Clear variables.
    $Members = $null;

    Write-Output($ExchangeOnlineSharedMailbox.Name + ": Getting all identities with 'SendAs'.");

    #Get mailbox permissions.
    $Identities = $ExchangeOnlineSharedMailbox | Get-OnlineRecipientPermission | Where-Object {$_.Trustee -notlike "*NT AUTHORITY*" -and $_.AccessRights -eq "SendAs"};

    #Foreach permission.
    Foreach($Identity in $Identities)
    {
        #Clear variables.
        $Group = $null;
        $User = $null;
        
        #If the recepient is a user.
        If($User = $ExchangeOnlineRecipients | Where-Object {$_.PrimarySmtpAddress -eq $Identity.Trustee})
        {
            Write-Output($ExchangeOnlineSharedMailbox.Name + ": '" + $Identity.Trustee + "' is a user and have the 'Send As' permission.");

            #Add address to array.
            $Members += @($User.PrimarySmtpAddress);
        }
        ElseIf($Group = Get-AzureADGroup -SearchString $Identity.Trustee)
        {
            Write-Output($ExchangeOnlineSharedMailbox.Name + ": '" + $Identity.Trustee + "' is a group and have the 'Send As' permission, getting nested groups.");

            #Add address to array.
            $Members += (Get-AzureADNestedGroups -ObjectId $Group.ObjectId);
        }
    }

    #Create new object.
    $SharedMailbox = New-Object –TypeName PSObject;

    #Add property to object.
    Add-Member -InputObject $SharedMailbox –MemberType NoteProperty –Name Mailbox –Value $ExchangeOnlineSharedMailbox.Name;
    Add-Member -InputObject $SharedMailbox –MemberType NoteProperty –Name PrimarySmtpAddress –Value $ExchangeOnlineSharedMailbox.PrimarySmtpAddress;
    Add-Member -InputObject $SharedMailbox –MemberType NoteProperty –Name Placement –Value "Office365";
    Add-Member -InputObject $SharedMailbox –MemberType NoteProperty –Name Access –Value "SendAs";
    Add-Member -InputObject $SharedMailbox –MemberType NoteProperty –Name Members –Value $Members;

    #Add to object array..
    $SharedMailboxes += $SharedMailbox;

    Write-Output ("");
}

Write-Output("##### Shared Mailbox - Send On Behalf To #####");

#Exchange Online - Shared Mailbox - Send On Behalf To.
Foreach($ExchangeOnlineSharedMailbox in $ExchangeOnlineSharedMailboxes)
{
    #Clear variables.
    $Members = $null;

    Write-Output($ExchangeOnlineSharedMailbox.Name + ": Getting all identities with 'GrantSendOnBehalfTo'.");

    #Get mailbox permissions.
    $Identities = $ExchangeOnlineSharedMailbox.GrantSendOnBehalfTo;

    #Foreach permission.
    Foreach($Identity in $Identities)
    {
        #Clear variables.
        $Group = $null;
        $User = $null;
        
        #If the recepient is a user.
        If($User = $ExchangeOnlineRecipients | Where-Object {$_.Name -eq $Identity})
        {
            Write-Output($ExchangeOnlineSharedMailbox.Name + ": '" + $Identity + "' is a user, and have the 'GrantSendOnBehalfTo' permission.");

            #Add address to array.
            $Members += @($User.PrimarySmtpAddress);
        }
        ElseIf($Group = Get-AzureADGroup -SearchString $Identity)
        {
            Write-Output($ExchangeOnlineSharedMailbox.Name + ": '" + $Identity + "' is a group and have the 'GrantSendOnBehalfTo' permission, getting nested groups.");

            #Add address to array.
            $Members += (Get-AzureADNestedGroups -ObjectId $Group.ObjectId);
        }
    }

    #Create new object.
    $SharedMailbox = New-Object –TypeName PSObject;

    #Add property to object.
    Add-Member -InputObject $SharedMailbox –MemberType NoteProperty –Name Mailbox –Value $ExchangeOnlineSharedMailbox.Name;
    Add-Member -InputObject $SharedMailbox –MemberType NoteProperty –Name PrimarySmtpAddress –Value $ExchangeOnlineSharedMailbox.PrimarySmtpAddress;
    Add-Member -InputObject $SharedMailbox –MemberType NoteProperty –Name Placement –Value "Office365";
    Add-Member -InputObject $SharedMailbox –MemberType NoteProperty –Name Access –Value "GrantSendOnBehalfTo";
    Add-Member -InputObject $SharedMailbox –MemberType NoteProperty –Name Members –Value $Members;

    #Add to object array..
    $SharedMailboxes += $SharedMailbox;

    Write-Output ("");
}

Write-Output("##### Resources - Full Access #####");

#Exchange Online - Resources - Full Access.
Foreach($ExchangeOnlineResource in $ExchangeOnlineResources)
{
    #Clear variables.
    $Members = $null;

    Write-Output($ExchangeOnlineResource.Name + ": Getting all identities with 'FullAccess'.");

    #Get mailbox permissions.
    $Identities = $ExchangeOnlineResource | Get-OnlineMailboxPermission | Where-Object {$_.User -notlike "*NT AUTHORITY*" -and $_.AccessRights -eq "FullAccess"};

    #Foreach full access permission.
    Foreach($Identity in $Identities)
    {
        #Clear variables.
        $Group = $null;
        $User = $null;
        
        #If the recepient is a user.
        If($User = $ExchangeOnlineRecipients | Where-Object {$_.PrimarySmtpAddress -eq $Identity.User})
        {
            Write-Output($ExchangeOnlineResource.Name + ": '" + $Identity.User + "' is a user, and have the 'Full Acess' permission.");

            #Add address to array.
            $Members += @($User.PrimarySmtpAddress);
        }
        ElseIf($Group = Get-AzureADGroup -SearchString $Identity.User)
        {
            Write-Output($ExchangeOnlineResource.Name + ": '" + $Identity.User + "' is a group and have the 'Full Acess' permission, getting nested groups.");

            #Add address to array.
            $Members += (Get-AzureADNestedGroups -ObjectId $Group.ObjectId);
        }
    }

    #Create new object.
    $Resource = New-Object –TypeName PSObject;

    #Add property to object.
    Add-Member -InputObject $Resource –MemberType NoteProperty –Name Mailbox –Value $ExchangeOnlineResource.Name;
    Add-Member -InputObject $Resource –MemberType NoteProperty –Name PrimarySmtpAddress –Value $ExchangeOnlineResource.PrimarySmtpAddress;
    Add-Member -InputObject $Resource –MemberType NoteProperty –Name Placement –Value "Office365";
    Add-Member -InputObject $Resource –MemberType NoteProperty –Name Access –Value "FullAccess";
    Add-Member -InputObject $Resource –MemberType NoteProperty –Name Members –Value $Members;

    #Add to object array..
    $Resources += $Resource;

    Write-Output ("");
}

Write-Output("##### Resources - Send As #####");

#Exchange Online - Resources - Send As.
Foreach($ExchangeOnlineResource in $ExchangeOnlineResources)
{
    #Clear variables.
    $Members = $null;

    Write-Output($ExchangeOnlineResource.Name + ": Getting all identities with 'SendAs'.");

    #Get mailbox permissions.
    $Identities = $ExchangeOnlineResource | Get-OnlineRecipientPermission | Where-Object {$_.Trustee -notlike "*NT AUTHORITY*" -and $_.AccessRights -eq "SendAs"};

    #Foreach permission.
    Foreach($Identity in $Identities)
    {
        #Clear variables.
        $Group = $null;
        $User = $null;
        
        #If the recepient is a user.
        If($User = $ExchangeOnlineRecipients | Where-Object {$_.PrimarySmtpAddress -eq $Identity.Trustee})
        {
            Write-Output($ExchangeOnlineResource.Name + ": '" + $Identity.Trustee + "' is a user, and have the 'SendAs' permission.");

            #Add address to array.
            $Members += @($User.PrimarySmtpAddress);
        }
        ElseIf($Group = Get-AzureADGroup -SearchString $Identity.Trustee)
        {
            Write-Output($ExchangeOnlineResource.Name + ": '" + $Identity.Trustee + "' is a group and have the 'SendAs' permission, getting nested groups.");

            #Add address to array.
            $Members += (Get-AzureADNestedGroups -ObjectId $Group.ObjectId);
        }
    }

    #Create new object.
    $Resource = New-Object –TypeName PSObject;

    #Add property to object.
    Add-Member -InputObject $Resource –MemberType NoteProperty –Name Mailbox –Value $ExchangeOnlineResource.Name;
    Add-Member -InputObject $Resource –MemberType NoteProperty –Name PrimarySmtpAddress –Value $ExchangeOnlineResource.PrimarySmtpAddress;
    Add-Member -InputObject $Resource –MemberType NoteProperty –Name Placement –Value "Office365";
    Add-Member -InputObject $Resource –MemberType NoteProperty –Name Access –Value "SendAs";
    Add-Member -InputObject $Resource –MemberType NoteProperty –Name Members –Value $Members;

    #Add to object array..
    $Resources += $Resource;

    Write-Output ("");
}

Write-Output("##### Resources - Send On Behalf To #####");

#Exchange Online - Resources - Send On Behalf To.
Foreach($ExchangeOnlineResource in $ExchangeOnlineResources)
{
    #Clear variables.
    $Members = $null;

    Write-Output($ExchangeOnlineResource.Name + ": Getting all identities with 'GrantSendOnBehalfTo'.");

    #Get permissions.
    $Identities = $ExchangeOnlineResource.GrantSendOnBehalfTo;

    #Foreach full access permission.
    Foreach($Identity in $Identities)
    {
        #Clear variables.
        $Group = $null;
        $User = $null;
        
        #If the recepient is a user.
        If($User = $ExchangeOnlineRecipients | Where-Object {$_.Name -eq $Identity})
        {
            Write-Output($ExchangeOnlineResource.Name + ": '" + $Identity + "' is a user, and have the 'GrantSendOnBehalfTo' permission.");

            #Add address to array.
            $Members += @($User.PrimarySmtpAddress);
        }
        ElseIf($Group = Get-AzureADGroup -SearchString $Identity)
        {
            Write-Output($ExchangeOnlineResource.Name + ": '" + $Identity + "' is a group and have the 'GrantSendOnBehalfTo' permission, getting nested groups.");

            #Add address to array.
            $Members += (Get-AzureADNestedGroups -ObjectId $Group.ObjectId);
        }
    }

    #Create new object.
    $Resource = New-Object –TypeName PSObject;

    #Add property to object.
    Add-Member -InputObject $Resource –MemberType NoteProperty –Name Mailbox –Value $ExchangeOnlineResource.Name;
    Add-Member -InputObject $Resource –MemberType NoteProperty –Name PrimarySmtpAddress –Value $ExchangeOnlineResource.PrimarySmtpAddress;
    Add-Member -InputObject $Resource –MemberType NoteProperty –Name Placement –Value "Office365";
    Add-Member -InputObject $Resource –MemberType NoteProperty –Name Access –Value "GrantSendOnBehalfTo";
    Add-Member -InputObject $Resource –MemberType NoteProperty –Name Members –Value $Members;

    #Add to object array..
    $Resources += $Resource;

    Write-Output ("");
}

Write-Output("##### Distribution Groups - Send On Behalf To #####");

#Exchange - Distribution Groups - Send On Behalf To.
Foreach($ExchangeDistributionsgroup in $ExchangeDistributionsgroups)
{
    #Clear variables.
    $Members = $null;
    $Placement = $null;

    Write-Output($ExchangeDistributionsgroup.Name + ": Getting all identities with 'GrantSendOnBehalfTo'.");

    #Get permission.
    $Identities = $ExchangeDistributionsgroup.GrantSendOnBehalfTo;

    #Foreach permission.
    Foreach($Identity in $Identities)
    {
        #If the identity isn't.
        If($Identity.Name -ne "Exchange Recipient Administrators")
        {
            #Clear variables.
            $ADObject = $null;
        
            #If the recepient is a user.
            If($ADObject = Get-ADObject -Identity $Identity.DistinguishedName -Properties mail)
            {
                #If the AD object is a user.
                If($ADObject.ObjectClass -eq "user")
                {
                    Write-Output($ExchangeDistributionsgroup.Name + ": '" + $ADObject.Name + "' is a user, and have the 'GrantSendOnBehalfTo' permission.");

                    #Add address to array.
                    $Members += @($ADObject.Mail);
                }
                #If the AD object is a group.
                Elseif($ADObject.ObjectClass -eq "group")
                {
                    Write-Output($ExchangeDistributionsgroup.Name + ": '" + $ADObject.Name + "' is a group, and have the 'GrantSendOnBehalfTo' permission, getting members.");

                    #Get nested group members.
                    $Members += (Get-ADNestedGroups -Identity $ADObject.DistinguishedName);
                }
            }
        }
    }

    #Check object is Dir Synced.
    If($ExchangeDistributionsgroup.IsDirSynced)
    {
        #On-Premise.
        $Placement = "OnPrem";
    }
    Else
    {
        #Office 365.
        $Placement = "Office365";
    }

    #Create new object.
    $DistributionGroup = New-Object –TypeName PSObject;

    #Add property to object.
    Add-Member -InputObject $DistributionGroup –MemberType NoteProperty –Name Mailbox –Value $ExchangeDistributionsgroup.Name;
    Add-Member -InputObject $DistributionGroup –MemberType NoteProperty –Name PrimarySmtpAddress –Value ($ExchangeDistributionsgroup.PrimarySmtpAddress.Local + "@" + $ExchangeDistributionsgroup.PrimarySmtpAddress.Domain);
    Add-Member -InputObject $DistributionGroup –MemberType NoteProperty –Name Placement –Value $Placement;
    Add-Member -InputObject $DistributionGroup –MemberType NoteProperty –Name Access –Value "GrantSendOnBehalfTo";
    Add-Member -InputObject $DistributionGroup –MemberType NoteProperty –Name Members –Value $Members;

    #Add to object array..
    $DistributionGroups += $DistributionGroup;

    Write-Output ("");
}

Write-Output("##### Distribution Groups - Managed By #####");

#Exchange - Distribution Groups - Managed By.
Foreach($ExchangeDistributionsgroup in $ExchangeDistributionsgroups)
{
    #Clear variables.
    $Members = $null;
    $Placement = $null;

    Write-Output($ExchangeDistributionsgroup.Name + ": Getting all identities with 'ManagedBy'.");

    #Get mailbox permissions.
    $Identities = $ExchangeDistributionsgroup.ManagedBy;

    #Foreach managed by permission.
    Foreach($Identity in $Identities)
    {
        #If the identity isn't.
        If($Identity.Name -ne "Exchange Recipient Administrators")
        {
            #Clear variables.
            $ADObject = $null;
        
            #If the recepient is a user.
            If($ADObject = Get-ADObject -Identity $Identity.DistinguishedName -Properties mail)
            {
                #If the AD object is a user.
                If($ADObject.ObjectClass -eq "user")
                {
                    Write-Output($ExchangeDistributionsgroup.Name + ": '" + $ADObject.Name + "' is a user, and have the 'ManagedBy' permission.");

                    #Add address to array.
                    $Members += @($ADObject.Mail);
                }
                #If the AD object is a group.
                Elseif($ADObject.ObjectClass -eq "group")
                {
                    Write-Output($ExchangeDistributionsgroup.Name + ": '" + $ADObject.Name + "' is a group, and have the 'ManagedBy' permission, getting members.");

                    #Get nested group members.
                    $Members += (Get-ADNestedGroups -Identity $ADObject.DistinguishedName);
                }
            }
        }
    }

    #Check object is Dir Synced.
    If($ExchangeDistributionsgroup.IsDirSynced)
    {
        #On-Premise.
        $Placement = "OnPrem";
    }
    Else
    {
        #Office 365.
        $Placement = "Office365";
    }

    #Create new object.
    $DistributionGroup = New-Object –TypeName PSObject;

    #Add property to object.
    Add-Member -InputObject $DistributionGroup –MemberType NoteProperty –Name Mailbox –Value $ExchangeDistributionsgroup.Name;
    Add-Member -InputObject $DistributionGroup –MemberType NoteProperty –Name PrimarySmtpAddress –Value ($ExchangeDistributionsgroup.PrimarySmtpAddress.Local + "@" + $ExchangeDistributionsgroup.PrimarySmtpAddress.Domain);
    Add-Member -InputObject $DistributionGroup –MemberType NoteProperty –Name Placement –Value $Placement;
    Add-Member -InputObject $DistributionGroup –MemberType NoteProperty –Name Access –Value "ManagedBy";
    Add-Member -InputObject $DistributionGroup –MemberType NoteProperty –Name Members –Value $Members;

    #Add to object array..
    $DistributionGroups += $DistributionGroup;

    Write-Output ("");
}

Write-Output("##### Distribution Groups - Members #####");

#Exchange - Distribution Groups - Members.
Foreach($ExchangeDistributionsgroup in $ExchangeDistributionsgroups)
{
    #Clear variables.
    $Members = $null;
    $Placement = $null;

    Write-Output($ExchangeDistributionsgroup.Name + ": Getting all identities.");

    #Get members.
    $Identities = $ExchangeDistributionsgroup | Get-DistributionGroupMember;

    #Foreach member.
    Foreach($Identity in $Identities)
    {
        #If the identity isn't.
        If($Identity.Name -ne "Exchange Recipient Administrators")
        {
            #Clear variables.
            $ADObject = $null;
        
            #If the recepient is a user.
            If($ADObject = Get-ADObject -Identity $Identity.DistinguishedName -Properties mail)
            {
                #If the AD object is a user.
                If($ADObject.ObjectClass -eq "user")
                {
                    Write-Output($ExchangeDistributionsgroup.Name + ": '" + $ADObject.Name + "' is a user, and is a member.");

                    #Add address to array.
                    $Members += @($ADObject.Mail);
                }
                #If the AD object is a group.
                Elseif($ADObject.ObjectClass -eq "group")
                {
                    Write-Output($ExchangeDistributionsgroup.Name + ": '" + $ADObject.Name + "' is a group, getting nested members.");

                    #Get nested group members.
                    $Members += (Get-ADNestedGroups -Identity $ADObject.DistinguishedName);
                }
            }
        }
    }

    #Check object is Dir Synced.
    If($ExchangeDistributionsgroup.IsDirSynced)
    {
        #On-Premise.
        $Placement = "OnPrem";
    }
    Else
    {
        #Office 365.
        $Placement = "Office365";
    }

    #Create new object.
    $DistributionGroup = New-Object –TypeName PSObject;

    #Add property to object.
    Add-Member -InputObject $DistributionGroup –MemberType NoteProperty –Name Mailbox –Value $ExchangeDistributionsgroup.Name;
    Add-Member -InputObject $DistributionGroup –MemberType NoteProperty –Name PrimarySmtpAddress –Value ($ExchangeDistributionsgroup.PrimarySmtpAddress.Local + "@" + $ExchangeDistributionsgroup.PrimarySmtpAddress.Domain);
    Add-Member -InputObject $DistributionGroup –MemberType NoteProperty –Name Placement –Value $Placement;
    Add-Member -InputObject $DistributionGroup –MemberType NoteProperty –Name Access –Value "Member";
    Add-Member -InputObject $DistributionGroup –MemberType NoteProperty –Name Members –Value $Members;

    #Add to object array..
    $DistributionGroups += $DistributionGroup;

    Write-Output ("");
}

Write-Output("##### Online Distribution Groups - Members #####");

#Exchange Online - Distribution Groups - Members.
Foreach($ExchangeOnlineDistributionsgroup in $ExchangeOnlineDistributionsgroups | Where-Object {$_.IsDirSynced -eq $false})
{
    #Clear variables.
    $Members = $null;
    $Placement = $null;

    Write-Output($ExchangeOnlineDistributionsgroup.Name + ": Getting all identities.");

    #Get members.
    $Identities = Get-OnlineDistributionGroupMember -Identity $ExchangeOnlineDistributionsgroup.Name;  

    #Foreach identity.
    Foreach($Identity in $Identities)
    {
        #Clear variables.
        $Group = $null;
        $User = $null;
        
        #If the recepient is a user.
        If("user" -in $Identity.ObjectClass)
        {
            Write-Output($ExchangeOnlineDistributionsgroup.Name + ": '" + $Identity.Name + "' is a user, and is a member.");

            #Add member.
            $Members += @($Identity.PrimarySmtpAddress);
        }
        #If the recepient is a group.
        ElseIf("group" -in $Identity.ObjectClass)
        {
            Write-Output($ExchangeOnlineDistributionsgroup.Name + ": '" + $Identity.Name + "' is a group, getting nested members.");

            #Add members.
            $Members += (Get-AzureADNestedGroups -ObjectId (Get-AzureADGroup -Filter "Displayname eq '$($Identity.DisplayName)'").ObjectId)
        }
    }

    #Check if object is Dir Synced.
    If($ExchangeOnlineDistributionsgroup.IsDirSynced)
    {
        #On-Premise.
        $Placement = "OnPrem";
    }
    Else
    {
        #Office 365.
        $Placement = "Office365";
    }

    #Create new object.
    $DistributionGroup = New-Object –TypeName PSObject;

    #Add property to object.
    Add-Member -InputObject $DistributionGroup –MemberType NoteProperty –Name Mailbox –Value $ExchangeOnlineDistributionsgroup.Name;
    Add-Member -InputObject $DistributionGroup –MemberType NoteProperty –Name PrimarySmtpAddress –Value ($ExchangeOnlineDistributionsgroup.PrimarySmtpAddress).ToString();
    Add-Member -InputObject $DistributionGroup –MemberType NoteProperty –Name Placement –Value $Placement;
    Add-Member -InputObject $DistributionGroup –MemberType NoteProperty –Name Access –Value "Member";
    Add-Member -InputObject $DistributionGroup –MemberType NoteProperty –Name Members –Value $Members;

    #Add to object array..
    $DistributionGroups += $DistributionGroup;

    Write-Output ("");
}

Write-Output("##### Online Distribution Groups - Send On Behalf To #####");

#Exchange Online - Distribution Groups - Send On Behalf To.
Foreach($ExchangeOnlineDistributionsgroup in $ExchangeOnlineDistributionsgroups | Where-Object {$_.IsDirSynced -eq $false})
{
    #Clear variables.
    $Members = $null;
    $Placement = $null;

    Write-Output($ExchangeOnlineDistributionsgroup.Name + ": Getting all identities with 'GrantSendOnBehalfTo'.");

    #Get members.
    $Identities = $ExchangeOnlineDistributionsgroup.GrantSendOnBehalfTo;

    #Foreach identity.
    Foreach($Identity in $Identities)
    {
        #Clear variables.
        $Group = $null;
        $User = $null;
        
        #Get object.
        $Object = (Get-OnlineRecipient -Identity $Identity -ErrorAction SilentlyContinue); 
       
        #If the object is found.
        If($Object)
        {
            #If the recepient is a user.
            If("user" -in $Object.ObjectClass)
            {
                Write-Output($ExchangeOnlineDistributionsgroup.Name + ": '" + $Object.Name + "' is a user, and is a member.");

                #Add member.
                $Members += @($Object.PrimarySmtpAddress);
            }
            #If the recepient is a group.
            ElseIf("group" -in $Object.ObjectClass)
            {
                Write-Output($ExchangeOnlineDistributionsgroup.Name + ": '" + $Object.Name + "' is a group, getting nested members.");

                #Add members.
                $Members += (Get-AzureADNestedGroups -ObjectId (Get-AzureADGroup -Filter "Displayname eq '$($Identity.DisplayName)'").ObjectId)
            }
        }
    }

    #Check if object is Dir Synced.
    If($ExchangeOnlineDistributionsgroup.IsDirSynced)
    {
        #On-Premise.
        $Placement = "OnPrem";
    }
    Else
    {
        #Office 365.
        $Placement = "Office365";
    }

    #Create new object.
    $DistributionGroup = New-Object –TypeName PSObject;

    #Add property to object.
    Add-Member -InputObject $DistributionGroup –MemberType NoteProperty –Name Mailbox –Value $ExchangeOnlineDistributionsgroup.Name;
    Add-Member -InputObject $DistributionGroup –MemberType NoteProperty –Name PrimarySmtpAddress –Value ($ExchangeOnlineDistributionsgroup.PrimarySmtpAddress).ToString();
    Add-Member -InputObject $DistributionGroup –MemberType NoteProperty –Name Placement –Value $Placement;
    Add-Member -InputObject $DistributionGroup –MemberType NoteProperty –Name Access –Value "GrantSendOnBehalfTo";
    Add-Member -InputObject $DistributionGroup –MemberType NoteProperty –Name Members –Value $Members;

    #Add to object array..
    $DistributionGroups += $DistributionGroup;

    Write-Output ("");
}

Write-Output("##### Online Distribution Groups - Managed By #####");

#Exchange Online - Distribution Groups - Managed By.
Foreach($ExchangeOnlineDistributionsgroup in $ExchangeOnlineDistributionsgroups | Where-Object {$_.IsDirSynced -eq $false})
{
    #Clear variables.
    $Members = $null;
    $Placement = $null;

    Write-Output($ExchangeOnlineDistributionsgroup.Name + ": Getting all identities with 'ManagedBy'.");

    #Get members.
    $Identities = $ExchangeOnlineDistributionsgroup.ManagedBy;

    #Foreach identity.
    Foreach($Identity in $Identities)
    {
        #Clear variables.
        $Group = $null;
        $User = $null;
        
        #Get object.
        $Object = (Get-OnlineRecipient -Identity $Identity -ErrorAction SilentlyContinue);

        #If the object is found.
        If($Object)
        {
            #If the recepient is a user.
            If("user" -in $Object.ObjectClass)
            {
                Write-Output($ExchangeOnlineDistributionsgroup.Name + ": '" + $Object.Name + "' is a user, and is a member.");

                #Add member.
                $Members += @($Object.PrimarySmtpAddress);
            }
            #If the recepient is a group.
            ElseIf("group" -in $Object.ObjectClass)
            {
                Write-Output($ExchangeOnlineDistributionsgroup.Name + ": '" + $Object.Name + "' is a group, getting nested members.");

                #Add members.
                $Members += (Get-AzureADNestedGroups -ObjectId (Get-AzureADGroup -Filter "Displayname eq '$($Identity.DisplayName)'").ObjectId)
            }
        }
    }

    #Check if object is Dir Synced.
    If($ExchangeOnlineDistributionsgroup.IsDirSynced)
    {
        #On-Premise.
        $Placement = "OnPrem";
    }
    Else
    {
        #Office 365.
        $Placement = "Office365";
    }

    #Create new object.
    $DistributionGroup = New-Object –TypeName PSObject;

    #Add property to object.
    Add-Member -InputObject $DistributionGroup –MemberType NoteProperty –Name Mailbox –Value $ExchangeOnlineDistributionsgroup.Name;
    Add-Member -InputObject $DistributionGroup –MemberType NoteProperty –Name PrimarySmtpAddress –Value ($ExchangeOnlineDistributionsgroup.PrimarySmtpAddress).ToString();
    Add-Member -InputObject $DistributionGroup –MemberType NoteProperty –Name Placement –Value $Placement;
    Add-Member -InputObject $DistributionGroup –MemberType NoteProperty –Name Access –Value "ManagedBy";
    Add-Member -InputObject $DistributionGroup –MemberType NoteProperty –Name Members –Value $Members;

    #Add to object array..
    $DistributionGroups += $DistributionGroup;

    Write-Output ("");
}

Write-Output("##### Online Distribution Groups - Send As #####");

#Exchange Online - Distribution Groups - Send As.
Foreach($ExchangeOnlineDistributionsgroup in $ExchangeOnlineDistributionsgroups | Where-Object {$_.IsDirSynced -eq $false})
{
    #Clear variables.
    $Members = $null;
    $Placement = $null;

    Write-Output($ExchangeOnlineDistributionsgroup.Name + ": Getting all identities with 'SendAs'.");

    #Get members.
    $Identities = $ExchangeOnlineDistributionsgroup | Get-OnlineRecipientPermission | Where-Object {$_.AccessRights -eq "SendAs"};

    #Foreach permission.
    Foreach($Identity in $Identities)
    {
        #Clear variables.
        $Group = $null;
        $User = $null;
        
        #If the recepient is a user.
        If($User = $ExchangeOnlineRecipients | Where-Object {$_.PrimarySmtpAddress -eq $Identity.Trustee})
        {
            Write-Output($ExchangeOnlineDistributionsgroup.Name + ": '" + $Identity.Trustee + "' is a user and have the 'Send As' permission.");

            #Add address to array.
            $Members += @($User.PrimarySmtpAddress);
        }
        ElseIf($Group = Get-AzureADGroup -SearchString $Identity.Trustee)
        {
            Write-Output($ExchangeOnlineDistributionsgroup.Name + ": '" + $Identity.Trustee + "' is a group and have the 'Send As' permission, getting nested groups.");

            #Add address to array.
            $Members += (Get-AzureADNestedGroups -ObjectId $Group.ObjectId);
        }
    }

    #Check if object is Dir Synced.
    If($ExchangeOnlineDistributionsgroup.IsDirSynced)
    {
        #On-Premise.
        $Placement = "OnPrem";
    }
    Else
    {
        #Office 365.
        $Placement = "Office365";
    }

    #Create new object.
    $DistributionGroup = New-Object –TypeName PSObject;

    #Add property to object.
    Add-Member -InputObject $DistributionGroup –MemberType NoteProperty –Name Mailbox –Value $ExchangeOnlineDistributionsgroup.Name;
    Add-Member -InputObject $DistributionGroup –MemberType NoteProperty –Name PrimarySmtpAddress –Value ($ExchangeOnlineDistributionsgroup.PrimarySmtpAddress).ToString();
    Add-Member -InputObject $DistributionGroup –MemberType NoteProperty –Name Placement –Value $Placement;
    Add-Member -InputObject $DistributionGroup –MemberType NoteProperty –Name Access –Value "SendAs";
    Add-Member -InputObject $DistributionGroup –MemberType NoteProperty –Name Members –Value $Members;

    #Add to object array..
    $DistributionGroups += $DistributionGroup;

    Write-Output ("");
}

#Counters.
$SharedMailboxCounter = 1;
$ResourceCounter = 1;
$DistributionGroupCounter = 1;

#Exchange Online - Shared Mailboxes - Add Members.
Foreach($SharedMailbox in $SharedMailboxes)
{
    Write-Output("########## - Shared Mailbox - " + $SharedMailbox.Mailbox + " (" + $SharedMailboxCounter + "/" + $SharedMailboxes.Count + ") - Members - Start ##########");

    #If members is not empty.
    If($SharedMailbox.Members -ne $null)
    {
        #Grant Send Behalf To.
        If($SharedMailbox.Access -eq "GrantSendOnBehalfTo")
        {
            Write-Output($SharedMailbox.Mailbox + ": Adding 'GrantSendOnBehalfTo'.");

            #Set permissions.
            Get-OnlineMailbox -Identity $SharedMailbox.Mailbox | Set-OnlineMailbox -GrantSendOnBehalfTo @{add=$SharedMailbox.Members};
        }
        #Full Access.
        ElseIf($SharedMailbox.Access -eq "FullAccess")
        {
            #Foreach member.
            Foreach($Member in $SharedMailbox.Members)
            {
                Write-Output($SharedMailbox.Mailbox + ": Adding 'FullAccess' to user '" + $Member + "'.");

                #Set permissions.
                Get-OnlineMailbox -Identity $SharedMailbox.Mailbox | Add-OnlineMailboxPermission -AccessRights FullAccess -User (($Member).ToString());
            }
        }
        #Full Access.
        ElseIf($SharedMailbox.Access -eq "SendAs")
        {
            #Foreach member.
            Foreach($Member in $SharedMailbox.Members)
            {
                Write-Output($SharedMailbox.Mailbox + ": Adding 'SendAs' to user '" + $Member + "'.");

                #Set permissions.
                Get-OnlineMailbox -Identity $SharedMailbox.Mailbox | Add-OnlineRecipientPermission -Trustee (($Member).ToString()) -AccessRights SendAs -Confirm:$false;
            }
        }
    }

    Write-Output("########## - Shared Mailbox - " + $SharedMailbox.Mailbox + " (" + $SharedMailboxCounter + "/" + $SharedMailboxes.Count + ") - Members - End ##########");
    Write-Output("");

    #Add to counter.
    $SharedMailboxCounter++;
}

#Exchange Online - Resources - Add Members.
Foreach($Resource in $Resources)
{
    Write-Output("########## - Resource - " + $Resource.Mailbox + " (" + $ResourceCounter + "/" + $Resources.Count + ") - Members - Start ##########");

    #If members is not empty.
    If($Resource.Members -ne $null)
    {
        #Grant Send Behalf To.
        If($Resource.Access -eq "GrantSendOnBehalfTo")
        {
            Write-Output ($Resource.Mailbox + ": Adding 'GrantSendOnBehalfTo'.");

            #Set permissions.
            Get-OnlineMailbox -Identity $Resource.Mailbox | Set-OnlineMailbox -GrantSendOnBehalfTo @{add=$Resource.Members};
        }
        #Full Access.
        ElseIf($Resource.Access -eq "FullAccess")
        {
            #Foreach member.
            Foreach($Member in $Resource.Members)
            {
                Write-Output($Resource.Mailbox + ": Adding 'FullAccess' to user '" + $Member + "'.");

                #Set permissions.
                Get-OnlineMailbox -Identity $Resource.Mailbox | Add-OnlineMailboxPermission -AccessRights FullAccess -User (($Member).ToString());
            }
        }
        #Full Access.
        ElseIf($Resource.Access -eq "SendAs")
        {
            #Foreach member.
            Foreach($Member in $Resource.Members)
            {
                Write-Output($Resource.Mailbox + ": Adding 'SendAs' to user '" + $Member + "'.");

                #Set permissions.
                Get-OnlineMailbox -Identity $Resource.Mailbox | Add-OnlineRecipientPermission -Trustee (($Member).ToString()) -AccessRights SendAs -Confirm:$false;
            }
        }
    }

    Write-Output("########## - Resource - " + $Resource.Mailbox + " (" + $ResourceCounter + "/" + $Resources.Count + ") - Members - End ##########");
    Write-Output("");

    #Add to counter.
    $ResourceCounter++;
}

#Exchange Online - Distribution Group - Add Members.
Foreach($Distributiongroup in $Distributiongroups)
{
    Write-Output("########## - Distribution Group - " + $Distributiongroup.Mailbox + " (" + $DistributionGroupCounter + "/" + $DistributionGroups.Count + ") - Members - Start ##########");

    #If members is not empty.
    If($Distributiongroup.Members -ne $null)
    {
        #Grant Send Behalf To.
        If($Distributiongroup.Access -eq "GrantSendOnBehalfTo")
        {
            Write-Output ($Distributiongroup.Mailbox + ": Adding 'GrantSendOnBehalfTo'.");

            #If the group is on prem.
            If($Distributiongroup.Access -eq "OnPrem")
            {
                #Set permissions.
                Get-DistributionGroup $Distributiongroup.Mailbox | Set-DistributionGroup -GrantSendOnBehalfTo @{add=$Distributiongroup.Members};
            }
            ElseIf($Distributiongroup.Access -eq "Office365")
            {
                #Set permissions.
                Get-OnlineDistributionGroup $Distributiongroup.Mailbox | Set-OnlineDistributionGroup -GrantSendOnBehalfTo @{add=$Distributiongroup.Members};
            }
        }
        #Full Access.
        ElseIf($Distributiongroup.Access -eq "SendAs")
        {
            #Foreach member.
            Foreach($Member in $Distributiongroup.Members)
            {
                Write-Output($Distributiongroup.Mailbox + ": Adding 'SendAs' to user '" + $Member + "'.");

                #If the group is on prem.
                If($Distributiongroup.Access -eq "OnPrem")
                {
                    #Set permissions.
                    Get-DistributionGroup -Identity $Distributiongroup.Mailbox | Add-ADPermission -User $Member -ExtendedRights "Send-As" -Confirm:$false;
                }
                ElseIf($Distributiongroup.Access -eq "Office365")
                {
                    #Set permissions.
                    Get-OnlineDistributionGroup -Identity $Distributiongroup.Mailbox | Add-OnlineRecipientPermission -Trustee (($Member).ToString()) -AccessRights SendAs -Confirm:$false;
                }
            }
        }
        #Member.
        ElseIf($Distributiongroup.Access -eq "Member")
        {
            #Foreach member.
            Foreach($Member in $Distributiongroup.Members)
            {
                Write-Output($Distributiongroup.Mailbox + ": Adding 'member' to user '" + $Member + "'.");

                #If the group is on prem.
                If($Distributiongroup.Access -eq "OnPrem")
                {
                    #Set permissions.
                    Get-DistributionGroup -Identity $Distributiongroup.Mailbox | Add-DistributionGroupMember -Member (($Member).ToString());
                }
                ElseIf($Distributiongroup.Access -eq "Office365")
                {
                    #Set permissions.
                    Get-OnlineDistributionGroup -Identity $Distributiongroup.Mailbox | Add-OnlineDistributionGroupMember -Member (($Member).ToString());
                }
            }
        }
    }

    Write-Output("########## - Distribution Group - " + $Distributiongroup.Mailbox + " (" + $DistributionGroupCounter + "/" + $DistributionGroups.Count + ") - Members - End ##########");
    Write-Output("");

    #Add to counter.
    $ResourceCounter++;
}

############### Main - End ###############
#endregion

#region begin finalize
############### Finalize - Start ###############

#Remove sessions.
Remove-PSSession -Session $SessionExchangeOnline;

############### Finalize - End ###############
#endregion

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#requires -version 3

.SYNOPSIS

Get nested group members of resources/shared mailboxes/distribution groups, and add them to parent.

.DESCRIPTION

Loops through all members of resources/shared mailboxes/distributionlist and add them to the parent object.

.NOTES

Version: 1.0

Author: Alex Ø. T. Hansen

Creation Date: 17-09-2018

Purpose/Change: Initial script development

#region begin input

############### Input - Start ###############

#Credentials.

$ExchangeOnlineUsername = "<exchange online upn administrator>";

#Modules.

$ModuleExchangePS1 = "C:\Program Files\Microsoft\Exchange Server\V15\bin\RemoteExchange.ps1";

$ModuleExchangeOnlinePS1 = "CreateExoPSSession.ps1";

$ModuleExchangeOnlineDLL = "Microsoft.Exchange.Management.ExoPowershellModule.dll";

############### Input - End ###############

#endregion

#region begin boostrap

############### Bootstrap - Start ###############

#Import module Active Directory.

Import-Module ActiveDirectory | Out-Null;

#Import module Exchange.

. $ModuleExchangePS1;

Connect-ExchangeServer -auto -ClientApplication:ManagementShell | Out-Null;

#Import module Exchange Online.

$PSExoPowershellModuleRoot = (Get-ChildItem -Path $env:userprofile -Filter $ModuleExchangeOnlinePS1 -Recurse -ErrorAction SilentlyContinue -Force | Select -Last 1).DirectoryName;

$ExoPowershellModule = $ModuleExchangeOnlineDLL;

$ExoModulePath = [System.IO.Path]::Combine($PSExoPowershellModuleRoot, $ExoPowershellModule);

Import-Module $ExoModulePath;

$SessionExchangeOnline = New-ExoPSSession -UserPrincipalName $ExchangeOnlineUsername;

Import-PSSession $SessionExchangeOnline -Prefix Online | Out-Null;

#Import Azure AD.

Connect-AzureAD;

#Clear screen.

Clear-Host;

############### Bootstrap - End ###############

#endregion

#region begin functions

############### Functions - Start ###############

#Get nested Azure groups.

Function Get-AzureADNestedGroups

{

[cmdletbinding()]

Param

(

[Parameter(Mandatory=$true, HelpMessage="Please provide a valid identity.")]$ObjectId

)

#Get all groups/users of the root group.

$Members = Get-AzureADGroupMember -ObjectId $ObjectId;

#Foreach member in the group.

Foreach($Member in $Members)

{

#If the member is a group.

If($Member.ObjectType -eq "Group")

{

#Run the function again against the group.

$Users += (Get-AzureADNestedGroups -ObjectId $Member.ObjectId);

}

#If the user is a user.

If($Member.UserType -eq "Member")

{

#If the user isn't in the array.

If($Member.Mail -notin $Users)

{

#Add the user to the object array.

$Users += @($Member.Mail);

}

#Return the users

Return ,$Users;

}

#Get nested AD groups.

Function Get-ADNestedGroups

{

[cmdletbinding()]

Param

(

[Parameter(Mandatory=$true, HelpMessage="Please provide a valid identity.")]$Identity

)

#Get all groups/users of the root group.

$Members = Get-ADGroupMember -Identity $Identity;

#Foreach member in the group.

Foreach($Member in $Members)

{

#If the member is a group.

If($Member.ObjectClass -eq "group")

{

#Run the function again against the group.

$Users += Get-ADNestedGroups -Identity $Member.distinguishedName;

}

Else

{

#Clear variable.

$Mail = $null;

#Get member primary e-mail address.

If($Mail = (Get-ADobject -Identity $Member.distinguishedName -Properties mail).mail)

{

#Add the user to the object array.

$Users += @($Mail);

}

#Return the users

Return ,$Users;

}

############### Functions - End ###############

#endregion

#region begin main

############### Main - Start ###############

#Get shared mailboxes from on-prem and Office 365.

Write-Output("On-premise: Getting all shared mailboxes.");

$ExchangeSharedMailboxes = (Get-Mailbox -RecipientTypeDetails SharedMailbox -ResultSize Unlimited);

Write-Output("Office 365: Getting all shared mailboxes.");

$ExchangeOnlineSharedMailboxes = (Get-OnlineMailbox -RecipientTypeDetails SharedMailbox -ResultSize Unlimited);

#Get resources from on-prem and Office 365.

Write-Output("On-premise: Getting all resources.");

$ExchangeResources = (Get-Mailbox -Filter "RecipientTypeDetails -eq 'RoomMailbox' -or RecipientTypeDetails -eq 'EquipmentMailbox'" -ResultSize Unlimited);

Write-Output("Office 365: Getting all resources.");

$ExchangeOnlineResources = (Get-OnlineMailbox -Filter "RecipientTypeDetails -eq 'RoomMailbox' -or RecipientTypeDetails -eq 'EquipmentMailbox'" -ResultSize Unlimited);

#Get distributiongroups from on-prem and Office 365.

Write-Output("On-premise: Getting all distributiongroups.");

$ExchangeDistributionsgroups = (Get-DistributionGroup -Filter "RecipientTypeDetails -eq 'MailUniversalDistributionGroup' -or RecipientTypeDetails -eq 'MailUniversalSecurityGroup'" -ResultSize Unlimited);

Write-Output("Office 365: Getting all distributiongroups.");

$ExchangeOnlineDistributionsgroups = (Get-OnlineDistributionGroup -Filter "RecipientTypeDetails -eq 'MailUniversalDistributionGroup' -or RecipientTypeDetails -eq 'MailUniversalSecurityGroup'" -ResultSize Unlimited);

#Get recipients from on-prem and Office 365.

Write-Output("On-premise: Getting all recipients.");

$ExchangeRecipients = Get-Recipient -ResultSize Unlimited;

Write-Output("Office 365: Getting all recipients.");

$ExchangeOnlineRecipients = Get-OnlineRecipient -ResultSize Unlimited;

#Object array.

$SharedMailboxes = @();

$Resources = @();

$DistributionGroups = @();

Write-Output("");

Write-Output("##### Shared Mailbox - Full Access #####");

#Exchange Online - Shared Mailboxes - Full Access.

Foreach($ExchangeOnlineSharedMailbox in $ExchangeOnlineSharedMailboxes)

{

#Clear variables.

$Members = $null;

Write-Output($ExchangeOnlineSharedMailbox.Name + ": Getting all identities with 'FullAccess'.");

#Get mailbox permissions.

$Identities = $ExchangeOnlineSharedMailbox | Get-OnlineMailboxPermission | Where-Object {$_.User -notlike "*NT AUTHORITY*" -and $_.AccessRights -eq "FullAccess"};

#Foreach full access permission.

Foreach($Identity in $Identities)

{

#Clear variables.

$Group = $null;

$User = $null;

#If the recepient is a user.

If($User = $ExchangeOnlineRecipients | Where-Object {$_.PrimarySmtpAddress -eq $Identity.User})

{

Write-Output($ExchangeOnlineSharedMailbox.Name + ": '" + $Identity.User + "' is a user, and have the 'Full Acess' permission.");

#Add address to array.

$Members += @($User.PrimarySmtpAddress);

}

ElseIf($Group = Get-AzureADGroup -SearchString $Identity.User)

{

Write-Output($ExchangeOnlineSharedMailbox.Name + ": '" + $Identity.User + "' is a group and have the 'Full Acess' permission, getting nested groups.");

#Add address to array.

$Members += (Get-AzureADNestedGroups -ObjectId $Group.ObjectId);

}

#Create new object.

$SharedMailbox = New-Object –TypeName PSObject;

#Add property to object.

Add-Member -InputObject $SharedMailbox –MemberType NoteProperty –Name Mailbox –Value $ExchangeOnlineSharedMailbox.Name;

Add-Member -InputObject $SharedMailbox –MemberType NoteProperty –Name PrimarySmtpAddress –Value $ExchangeOnlineSharedMailbox.PrimarySmtpAddress;

Add-Member -InputObject $SharedMailbox –MemberType NoteProperty –Name Placement –Value "Office365";

Add-Member -InputObject $SharedMailbox –MemberType NoteProperty –Name Access –Value "FullAccess";

Add-Member -InputObject $SharedMailbox –MemberType NoteProperty –Name Members –Value $Members;

#Add to object array..

$SharedMailboxes += $SharedMailbox;

Write-Output ("");

}

Write-Output("##### Shared Mailbox - Send As #####");

#Exchange Online - Shared Mailboxes - Send As.

Foreach($ExchangeOnlineSharedMailbox in $ExchangeOnlineSharedMailboxes)

{

#Clear variables.

$Members = $null;

Write-Output($ExchangeOnlineSharedMailbox.Name + ": Getting all identities with 'SendAs'.");

#Get mailbox permissions.

$Identities = $ExchangeOnlineSharedMailbox | Get-OnlineRecipientPermission | Where-Object {$_.Trustee -notlike "*NT AUTHORITY*" -and $_.AccessRights -eq "SendAs"};

#Foreach permission.

Foreach($Identity in $Identities)

{

#Clear variables.

$Group = $null;

$User = $null;

#If the recepient is a user.

If($User = $ExchangeOnlineRecipients | Where-Object {$_.PrimarySmtpAddress -eq $Identity.Trustee})

{

Write-Output($ExchangeOnlineSharedMailbox.Name + ": '" + $Identity.Trustee + "' is a user and have the 'Send As' permission.");

#Add address to array.

$Members += @($User.PrimarySmtpAddress);

}

ElseIf($Group = Get-AzureADGroup -SearchString $Identity.Trustee)

{

Write-Output($ExchangeOnlineSharedMailbox.Name + ": '" + $Identity.Trustee + "' is a group and have the 'Send As' permission, getting nested groups.");

#Add address to array.

$Members += (Get-AzureADNestedGroups -ObjectId $Group.ObjectId);

}

#Create new object.

$SharedMailbox = New-Object –TypeName PSObject;

#Add property to object.

Add-Member -InputObject $SharedMailbox –MemberType NoteProperty –Name Mailbox –Value $ExchangeOnlineSharedMailbox.Name;

Add-Member -InputObject $SharedMailbox –MemberType NoteProperty –Name PrimarySmtpAddress –Value $ExchangeOnlineSharedMailbox.PrimarySmtpAddress;

Add-Member -InputObject $SharedMailbox –MemberType NoteProperty –Name Placement –Value "Office365";

Add-Member -InputObject $SharedMailbox –MemberType NoteProperty –Name Access –Value "SendAs";

Add-Member -InputObject $SharedMailbox –MemberType NoteProperty –Name Members –Value $Members;

#Add to object array..

$SharedMailboxes += $SharedMailbox;

Write-Output ("");

}

Write-Output("##### Shared Mailbox - Send On Behalf To #####");

#Exchange Online - Shared Mailbox - Send On Behalf To.

Foreach($ExchangeOnlineSharedMailbox in $ExchangeOnlineSharedMailboxes)

{

#Clear variables.

$Members = $null;

Write-Output($ExchangeOnlineSharedMailbox.Name + ": Getting all identities with 'GrantSendOnBehalfTo'.");

#Get mailbox permissions.

$Identities = $ExchangeOnlineSharedMailbox.GrantSendOnBehalfTo;

#Foreach permission.

Foreach($Identity in $Identities)

{

#Clear variables.

$Group = $null;

$User = $null;

#If the recepient is a user.

If($User = $ExchangeOnlineRecipients | Where-Object {$_.Name -eq $Identity})

{

Write-Output($ExchangeOnlineSharedMailbox.Name + ": '" + $Identity + "' is a user, and have the 'GrantSendOnBehalfTo' permission.");

#Add address to array.

$Members += @($User.PrimarySmtpAddress);

}

ElseIf($Group = Get-AzureADGroup -SearchString $Identity)

{

Write-Output($ExchangeOnlineSharedMailbox.Name + ": '" + $Identity + "' is a group and have the 'GrantSendOnBehalfTo' permission, getting nested groups.");

#Add address to array.

$Members += (Get-AzureADNestedGroups -ObjectId $Group.ObjectId);

}

#Create new object.

$SharedMailbox = New-Object –TypeName PSObject;

#Add property to object.

Add-Member -InputObject $SharedMailbox –MemberType NoteProperty –Name Mailbox –Value $ExchangeOnlineSharedMailbox.Name;

Add-Member -InputObject $SharedMailbox –MemberType NoteProperty –Name PrimarySmtpAddress –Value $ExchangeOnlineSharedMailbox.PrimarySmtpAddress;

Add-Member -InputObject $SharedMailbox –MemberType NoteProperty –Name Placement –Value "Office365";

Add-Member -InputObject $SharedMailbox –MemberType NoteProperty –Name Access –Value "GrantSendOnBehalfTo";

Add-Member -InputObject $SharedMailbox –MemberType NoteProperty –Name Members –Value $Members;

#Add to object array..

$SharedMailboxes += $SharedMailbox;

Write-Output ("");

}

Write-Output("##### Resources - Full Access #####");

#Exchange Online - Resources - Full Access.

Foreach($ExchangeOnlineResource in $ExchangeOnlineResources)

{

#Clear variables.

$Members = $null;

Write-Output($ExchangeOnlineResource.Name + ": Getting all identities with 'FullAccess'.");

#Get mailbox permissions.

$Identities = $ExchangeOnlineResource | Get-OnlineMailboxPermission | Where-Object {$_.User -notlike "*NT AUTHORITY*" -and $_.AccessRights -eq "FullAccess"};

#Foreach full access permission.

Foreach($Identity in $Identities)

{

#Clear variables.

$Group = $null;

$User = $null;

#If the recepient is a user.

If($User = $ExchangeOnlineRecipients | Where-Object {$_.PrimarySmtpAddress -eq $Identity.User})

{

Write-Output($ExchangeOnlineResource.Name + ": '" + $Identity.User + "' is a user, and have the 'Full Acess' permission.");

#Add address to array.

$Members += @($User.PrimarySmtpAddress);

}

ElseIf($Group = Get-AzureADGroup -SearchString $Identity.User)

{

Write-Output($ExchangeOnlineResource.Name + ": '" + $Identity.User + "' is a group and have the 'Full Acess' permission, getting nested groups.");

#Add address to array.

$Members += (Get-AzureADNestedGroups -ObjectId $Group.ObjectId);

}

#Create new object.

$Resource = New-Object –TypeName PSObject;

#Add property to object.

Add-Member -InputObject $Resource –MemberType NoteProperty –Name Mailbox –Value $ExchangeOnlineResource.Name;

Add-Member -InputObject $Resource –MemberType NoteProperty –Name PrimarySmtpAddress –Value $ExchangeOnlineResource.PrimarySmtpAddress;

Add-Member -InputObject $Resource –MemberType NoteProperty –Name Placement –Value "Office365";

Add-Member -InputObject $Resource –MemberType NoteProperty –Name Access –Value "FullAccess";

Add-Member -InputObject $Resource –MemberType NoteProperty –Name Members –Value $Members;

#Add to object array..

$Resources += $Resource;

Write-Output ("");

}

Write-Output("##### Resources - Send As #####");

#Exchange Online - Resources - Send As.

Foreach($ExchangeOnlineResource in $ExchangeOnlineResources)

{

#Clear variables.

$Members = $null;

Write-Output($ExchangeOnlineResource.Name + ": Getting all identities with 'SendAs'.");

#Get mailbox permissions.

$Identities = $ExchangeOnlineResource | Get-OnlineRecipientPermission | Where-Object {$_.Trustee -notlike "*NT AUTHORITY*" -and $_.AccessRights -eq "SendAs"};

#Foreach permission.

Foreach($Identity in $Identities)

{

#Clear variables.

$Group = $null;

$User = $null;

#If the recepient is a user.

If($User = $ExchangeOnlineRecipients | Where-Object {$_.PrimarySmtpAddress -eq $Identity.Trustee})

{

Write-Output($ExchangeOnlineResource.Name + ": '" + $Identity.Trustee + "' is a user, and have the 'SendAs' permission.");

#Add address to array.

$Members += @($User.PrimarySmtpAddress);

}

ElseIf($Group = Get-AzureADGroup -SearchString $Identity.Trustee)

{

Write-Output($ExchangeOnlineResource.Name + ": '" + $Identity.Trustee + "' is a group and have the 'SendAs' permission, getting nested groups.");

#Add address to array.

$Members += (Get-AzureADNestedGroups -ObjectId $Group.ObjectId);

}

#Create new object.

$Resource = New-Object –TypeName PSObject;

#Add property to object.

Add-Member -InputObject $Resource –MemberType NoteProperty –Name Mailbox –Value $ExchangeOnlineResource.Name;

Add-Member -InputObject $Resource –MemberType NoteProperty –Name PrimarySmtpAddress –Value $ExchangeOnlineResource.PrimarySmtpAddress;

Add-Member -InputObject $Resource –MemberType NoteProperty –Name Placement –Value "Office365";

Add-Member -InputObject $Resource –MemberType NoteProperty –Name Access –Value "SendAs";

Add-Member -InputObject $Resource –MemberType NoteProperty –Name Members –Value $Members;

#Add to object array..

$Resources += $Resource;

Write-Output ("");

}

Write-Output("##### Resources - Send On Behalf To #####");

#Exchange Online - Resources - Send On Behalf To.

Foreach($ExchangeOnlineResource in $ExchangeOnlineResources)

{

#Clear variables.

$Members = $null;

Write-Output($ExchangeOnlineResource.Name + ": Getting all identities with 'GrantSendOnBehalfTo'.");

#Get permissions.

$Identities = $ExchangeOnlineResource.GrantSendOnBehalfTo;

#Foreach full access permission.

Foreach($Identity in $Identities)

{

#Clear variables.

$Group = $null;

$User = $null;

#If the recepient is a user.

If($User = $ExchangeOnlineRecipients | Where-Object {$_.Name -eq $Identity})

{

Write-Output($ExchangeOnlineResource.Name + ": '" + $Identity + "' is a user, and have the 'GrantSendOnBehalfTo' permission.");

#Add address to array.

$Members += @($User.PrimarySmtpAddress);

}

ElseIf($Group = Get-AzureADGroup -SearchString $Identity)

{

Write-Output($ExchangeOnlineResource.Name + ": '" + $Identity + "' is a group and have the 'GrantSendOnBehalfTo' permission, getting nested groups.");

#Add address to array.

$Members += (Get-AzureADNestedGroups -ObjectId $Group.ObjectId);

}

#Create new object.

$Resource = New-Object –TypeName PSObject;

#Add property to object.

Add-Member -InputObject $Resource –MemberType NoteProperty –Name Mailbox –Value $ExchangeOnlineResource.Name;

Add-Member -InputObject $Resource –MemberType NoteProperty –Name PrimarySmtpAddress –Value $ExchangeOnlineResource.PrimarySmtpAddress;

Add-Member -InputObject $Resource –MemberType NoteProperty –Name Placement –Value "Office365";

Add-Member -InputObject $Resource –MemberType NoteProperty –Name Access –Value "GrantSendOnBehalfTo";

Add-Member -InputObject $Resource –MemberType NoteProperty –Name Members –Value $Members;

#Add to object array..

$Resources += $Resource;

Write-Output ("");

}

Write-Output("##### Distribution Groups - Send On Behalf To #####");

#Exchange - Distribution Groups - Send On Behalf To.

Foreach($ExchangeDistributionsgroup in $ExchangeDistributionsgroups)

{

#Clear variables.

$Members = $null;

$Placement = $null;

Write-Output($ExchangeDistributionsgroup.Name + ": Getting all identities with 'GrantSendOnBehalfTo'.");

#Get permission.

$Identities = $ExchangeDistributionsgroup.GrantSendOnBehalfTo;

#Foreach permission.

Foreach($Identity in $Identities)

{

#If the identity isn't.

If($Identity.Name -ne "Exchange Recipient Administrators")

{

#Clear variables.

$ADObject = $null;

#If the recepient is a user.

If($ADObject = Get-ADObject -Identity $Identity.DistinguishedName -Properties mail)

{

#If the AD object is a user.

If($ADObject.ObjectClass -eq "user")

{

Write-Output($ExchangeDistributionsgroup.Name + ": '" + $ADObject.Name + "' is a user, and have the 'GrantSendOnBehalfTo' permission.");

#Add address to array.

$Members += @($ADObject.Mail);

}

#If the AD object is a group.

Elseif($ADObject.ObjectClass -eq "group")

{

Write-Output($ExchangeDistributionsgroup.Name + ": '" + $ADObject.Name + "' is a group, and have the 'GrantSendOnBehalfTo' permission, getting members.");

#Get nested group members.

$Members += (Get-ADNestedGroups -Identity $ADObject.DistinguishedName);

}

#Check object is Dir Synced.

If($ExchangeDistributionsgroup.IsDirSynced)

{

#On-Premise.

$Placement = "OnPrem";

}

Else

{

#Office 365.

$Placement = "Office365";

}

#Create new object.

$DistributionGroup = New-Object –TypeName PSObject;

#Add property to object.

Add-Member -InputObject $DistributionGroup –MemberType NoteProperty –Name Mailbox –Value $ExchangeDistributionsgroup.Name;

Add-Member -InputObject $DistributionGroup –MemberType NoteProperty –Name PrimarySmtpAddress –Value ($ExchangeDistributionsgroup.PrimarySmtpAddress.Local + "@" + $ExchangeDistributionsgroup.PrimarySmtpAddress.Domain);

Add-Member -InputObject $DistributionGroup –MemberType NoteProperty –Name Placement –Value $Placement;

Add-Member -InputObject $DistributionGroup –MemberType NoteProperty –Name Access –Value "GrantSendOnBehalfTo";

Add-Member -InputObject $DistributionGroup –MemberType NoteProperty –Name Members –Value $Members;

#Add to object array..

$DistributionGroups += $DistributionGroup;

Write-Output ("");

}

Write-Output("##### Distribution Groups - Managed By #####");

#Exchange - Distribution Groups - Managed By.

Foreach($ExchangeDistributionsgroup in $ExchangeDistributionsgroups)

{

#Clear variables.

$Members = $null;

$Placement = $null;

Write-Output($ExchangeDistributionsgroup.Name + ": Getting all identities with 'ManagedBy'.");

#Get mailbox permissions.

$Identities = $ExchangeDistributionsgroup.ManagedBy;

#Foreach managed by permission.

Foreach($Identity in $Identities)

{

#If the identity isn't.

If($Identity.Name -ne "Exchange Recipient Administrators")

{

#Clear variables.

$ADObject = $null;

#If the recepient is a user.

If($ADObject = Get-ADObject -Identity $Identity.DistinguishedName -Properties mail)

{

#If the AD object is a user.

If($ADObject.ObjectClass -eq "user")

{

Write-Output($ExchangeDistributionsgroup.Name + ": '" + $ADObject.Name + "' is a user, and have the 'ManagedBy' permission.");

#Add address to array.

$Members += @($ADObject.Mail);

}

#If the AD object is a group.

Elseif($ADObject.ObjectClass -eq "group")

{

Write-Output($ExchangeDistributionsgroup.Name + ": '" + $ADObject.Name + "' is a group, and have the 'ManagedBy' permission, getting members.");

#Get nested group members.

$Members += (Get-ADNestedGroups -Identity $ADObject.DistinguishedName);

}

#Check object is Dir Synced.

If($ExchangeDistributionsgroup.IsDirSynced)

{

#On-Premise.

$Placement = "OnPrem";

}

Else

{

#Office 365.

$Placement = "Office365";

}

#Create new object.

$DistributionGroup = New-Object –TypeName PSObject;

#Add property to object.

Add-Member -InputObject $DistributionGroup –MemberType NoteProperty –Name Mailbox –Value $ExchangeDistributionsgroup.Name;

Add-Member -InputObject $DistributionGroup –MemberType NoteProperty –Name Placement –Value $Placement;

Add-Member -InputObject $DistributionGroup –MemberType NoteProperty –Name Access –Value "ManagedBy";

Add-Member -InputObject $DistributionGroup –MemberType NoteProperty –Name Members –Value $Members;

#Add to object array..

$DistributionGroups += $DistributionGroup;

Write-Output ("");

}

Write-Output("##### Distribution Groups - Members #####");

#Exchange - Distribution Groups - Members.

Foreach($ExchangeDistributionsgroup in $ExchangeDistributionsgroups)

{

#Clear variables.

$Members = $null;

$Placement = $null;

Write-Output($ExchangeDistributionsgroup.Name + ": Getting all identities.");

#Get members.

$Identities = $ExchangeDistributionsgroup | Get-DistributionGroupMember;

#Foreach member.

Foreach($Identity in $Identities)

{

#If the identity isn't.

If($Identity.Name -ne "Exchange Recipient Administrators")

{

#Clear variables.

$ADObject = $null;

#If the recepient is a user.

If($ADObject = Get-ADObject -Identity $Identity.DistinguishedName -Properties mail)

{

#If the AD object is a user.

If($ADObject.ObjectClass -eq "user")

{

Write-Output($ExchangeDistributionsgroup.Name + ": '" + $ADObject.Name + "' is a user, and is a member.");

#Add address to array.

$Members += @($ADObject.Mail);

}

#If the AD object is a group.

Elseif($ADObject.ObjectClass -eq "group")

{

Write-Output($ExchangeDistributionsgroup.Name + ": '" + $ADObject.Name + "' is a group, getting nested members.");

#Get nested group members.

$Members += (Get-ADNestedGroups -Identity $ADObject.DistinguishedName);

}

#Check object is Dir Synced.

If($ExchangeDistributionsgroup.IsDirSynced)

{

#On-Premise.

$Placement = "OnPrem";

}

Else

{

#Office 365.

$Placement = "Office365";

}

#Create new object.

$DistributionGroup = New-Object –TypeName PSObject;

#Add property to object.

Add-Member -InputObject $DistributionGroup –MemberType NoteProperty –Name Mailbox –Value $ExchangeDistributionsgroup.Name;

Add-Member -InputObject $DistributionGroup –MemberType NoteProperty –Name Placement –Value $Placement;

Add-Member -InputObject $DistributionGroup –MemberType NoteProperty –Name Access –Value "Member";

Add-Member -InputObject $DistributionGroup –MemberType NoteProperty –Name Members –Value $Members;

#Add to object array..

$DistributionGroups += $DistributionGroup;

Write-Output ("");

}

Write-Output("##### Online Distribution Groups - Members #####");

#Exchange Online - Distribution Groups - Members.

Foreach($ExchangeOnlineDistributionsgroup in $ExchangeOnlineDistributionsgroups | Where-Object {$_.IsDirSynced -eq $false})

{

#Clear variables.

$Members = $null;

$Placement = $null;

Write-Output($ExchangeOnlineDistributionsgroup.Name + ": Getting all identities.");

#Get members.

$Identities = Get-OnlineDistributionGroupMember -Identity $ExchangeOnlineDistributionsgroup.Name;

#Foreach identity.

Foreach($Identity in $Identities)

{

#Clear variables.

$Group = $null;

$User = $null;

#If the recepient is a user.

If("user" -in $Identity.ObjectClass)

{

Write-Output($ExchangeOnlineDistributionsgroup.Name + ": '" + $Identity.Name + "' is a user, and is a member.");

#Add member.

$Members += @($Identity.PrimarySmtpAddress);

}

#If the recepient is a group.

ElseIf("group" -in $Identity.ObjectClass)

{

Write-Output($ExchangeOnlineDistributionsgroup.Name + ": '" + $Identity.Name + "' is a group, getting nested members.");

#Add members.

$Members += (Get-AzureADNestedGroups -ObjectId (Get-AzureADGroup -Filter "Displayname eq '$($Identity.DisplayName)'").ObjectId)

}

#Check if object is Dir Synced.

If($ExchangeOnlineDistributionsgroup.IsDirSynced)

{

#On-Premise.

$Placement = "OnPrem";

}

Else

{

#Office 365.

$Placement = "Office365";

}

#Create new object.

$DistributionGroup = New-Object –TypeName PSObject;

#Add property to object.

Add-Member -InputObject $DistributionGroup –MemberType NoteProperty –Name Mailbox –Value $ExchangeOnlineDistributionsgroup.Name;

Add-Member -InputObject $DistributionGroup –MemberType NoteProperty –Name PrimarySmtpAddress –Value ($ExchangeOnlineDistributionsgroup.PrimarySmtpAddress).ToString();

Add-Member -InputObject $DistributionGroup –MemberType NoteProperty –Name Placement –Value $Placement;

Add-Member -InputObject $DistributionGroup –MemberType NoteProperty –Name Access –Value "Member";

Add-Member -InputObject $DistributionGroup –MemberType NoteProperty –Name Members –Value $Members;

#Add to object array..

$DistributionGroups += $DistributionGroup;

Write-Output ("");

}

Write-Output("##### Online Distribution Groups - Send On Behalf To #####");

#Exchange Online - Distribution Groups - Send On Behalf To.

Foreach($ExchangeOnlineDistributionsgroup in $ExchangeOnlineDistributionsgroups | Where-Object {$_.IsDirSynced -eq $false})

{

#Clear variables.

$Members = $null;

$Placement = $null;

Write-Output($ExchangeOnlineDistributionsgroup.Name + ": Getting all identities with 'GrantSendOnBehalfTo'.");

#Get members.

$Identities = $ExchangeOnlineDistributionsgroup.GrantSendOnBehalfTo;

#Foreach identity.

Foreach($Identity in $Identities)

{

#Clear variables.

$Group = $null;

$User = $null;

#Get object.

$Object = (Get-OnlineRecipient -Identity $Identity -ErrorAction SilentlyContinue);

#If the object is found.

If($Object)

{

#If the recepient is a user.

If("user" -in $Object.ObjectClass)

{

Write-Output($ExchangeOnlineDistributionsgroup.Name + ": '" + $Object.Name + "' is a user, and is a member.");

#Add member.

$Members += @($Object.PrimarySmtpAddress);

}

#If the recepient is a group.

ElseIf("group" -in $Object.ObjectClass)

{

Write-Output($ExchangeOnlineDistributionsgroup.Name + ": '" + $Object.Name + "' is a group, getting nested members.");

#Add members.

$Members += (Get-AzureADNestedGroups -ObjectId (Get-AzureADGroup -Filter "Displayname eq '$($Identity.DisplayName)'").ObjectId)

}

#Check if object is Dir Synced.

If($ExchangeOnlineDistributionsgroup.IsDirSynced)

{

#On-Premise.

$Placement = "OnPrem";

}

Else

{

#Office 365.

$Placement = "Office365";

}

#Create new object.

$DistributionGroup = New-Object –TypeName PSObject;

#Add property to object.

Add-Member -InputObject $DistributionGroup –MemberType NoteProperty –Name Mailbox –Value $ExchangeOnlineDistributionsgroup.Name;

Add-Member -InputObject $DistributionGroup –MemberType NoteProperty –Name PrimarySmtpAddress –Value ($ExchangeOnlineDistributionsgroup.PrimarySmtpAddress).ToString();

Add-Member -InputObject $DistributionGroup –MemberType NoteProperty –Name Placement –Value $Placement;

Add-Member -InputObject $DistributionGroup –MemberType NoteProperty –Name Access –Value "GrantSendOnBehalfTo";

Add-Member -InputObject $DistributionGroup –MemberType NoteProperty –Name Members –Value $Members;

#Add to object array..

$DistributionGroups += $DistributionGroup;

Write-Output ("");

}

Write-Output("##### Online Distribution Groups - Managed By #####");

#Exchange Online - Distribution Groups - Managed By.

Foreach($ExchangeOnlineDistributionsgroup in $ExchangeOnlineDistributionsgroups | Where-Object {$_.IsDirSynced -eq $false})

{

#Clear variables.

$Members = $null;

$Placement = $null;

Write-Output($ExchangeOnlineDistributionsgroup.Name + ": Getting all identities with 'ManagedBy'.");

#Get members.

$Identities = $ExchangeOnlineDistributionsgroup.ManagedBy;

#Foreach identity.

Foreach($Identity in $Identities)

{

#Clear variables.

$Group = $null;

$User = $null;

#Get object.

$Object = (Get-OnlineRecipient -Identity $Identity -ErrorAction SilentlyContinue);

#If the object is found.

If($Object)

{

#If the recepient is a user.

If("user" -in $Object.ObjectClass)

{

Write-Output($ExchangeOnlineDistributionsgroup.Name + ": '" + $Object.Name + "' is a user, and is a member.");

#Add member.

$Members += @($Object.PrimarySmtpAddress);

}

#If the recepient is a group.

ElseIf("group" -in $Object.ObjectClass)

{

Write-Output($ExchangeOnlineDistributionsgroup.Name + ": '" + $Object.Name + "' is a group, getting nested members.");

#Add members.

$Members += (Get-AzureADNestedGroups -ObjectId (Get-AzureADGroup -Filter "Displayname eq '$($Identity.DisplayName)'").ObjectId)

}

#Check if object is Dir Synced.

If($ExchangeOnlineDistributionsgroup.IsDirSynced)

{

#On-Premise.

$Placement = "OnPrem";

}

Else

{

#Office 365.

$Placement = "Office365";

}

#Create new object.

$DistributionGroup = New-Object –TypeName PSObject;

#Add property to object.

Add-Member -InputObject $DistributionGroup –MemberType NoteProperty –Name Mailbox –Value $ExchangeOnlineDistributionsgroup.Name;

Add-Member -InputObject $DistributionGroup –MemberType NoteProperty –Name PrimarySmtpAddress –Value ($ExchangeOnlineDistributionsgroup.PrimarySmtpAddress).ToString();

Add-Member -InputObject $DistributionGroup –MemberType NoteProperty –Name Placement –Value $Placement;

Add-Member -InputObject $DistributionGroup –MemberType NoteProperty –Name Access –Value "ManagedBy";

Add-Member -InputObject $DistributionGroup –MemberType NoteProperty –Name Members –Value $Members;

#Add to object array..

$DistributionGroups += $DistributionGroup;

Write-Output ("");

}

Write-Output("##### Online Distribution Groups - Send As #####");

#Exchange Online - Distribution Groups - Send As.

Foreach($ExchangeOnlineDistributionsgroup in $ExchangeOnlineDistributionsgroups | Where-Object {$_.IsDirSynced -eq $false})

{

#Clear variables.

$Members = $null;

$Placement = $null;

Write-Output($ExchangeOnlineDistributionsgroup.Name + ": Getting all identities with 'SendAs'.");

#Get members.

$Identities = $ExchangeOnlineDistributionsgroup | Get-OnlineRecipientPermission | Where-Object {$_.AccessRights -eq "SendAs"};

#Foreach permission.

Foreach($Identity in $Identities)

{

#Clear variables.

$Group = $null;

$User = $null;

#If the recepient is a user.

If($User = $ExchangeOnlineRecipients | Where-Object {$_.PrimarySmtpAddress -eq $Identity.Trustee})

{

Write-Output($ExchangeOnlineDistributionsgroup.Name + ": '" + $Identity.Trustee + "' is a user and have the 'Send As' permission.");

#Add address to array.

$Members += @($User.PrimarySmtpAddress);

}

ElseIf($Group = Get-AzureADGroup -SearchString $Identity.Trustee)

{

Write-Output($ExchangeOnlineDistributionsgroup.Name + ": '" + $Identity.Trustee + "' is a group and have the 'Send As' permission, getting nested groups.");

#Add address to array.

$Members += (Get-AzureADNestedGroups -ObjectId $Group.ObjectId);

}

#Check if object is Dir Synced.

If($ExchangeOnlineDistributionsgroup.IsDirSynced)

{

#On-Premise.

$Placement = "OnPrem";

}

Else

{

#Office 365.

$Placement = "Office365";

}

#Create new object.

$DistributionGroup = New-Object –TypeName PSObject;

#Add property to object.

Add-Member -InputObject $DistributionGroup –MemberType NoteProperty –Name Mailbox –Value $ExchangeOnlineDistributionsgroup.Name;

Add-Member -InputObject $DistributionGroup –MemberType NoteProperty –Name PrimarySmtpAddress –Value ($ExchangeOnlineDistributionsgroup.PrimarySmtpAddress).ToString();

Add-Member -InputObject $DistributionGroup –MemberType NoteProperty –Name Placement –Value $Placement;

Add-Member -InputObject $DistributionGroup –MemberType NoteProperty –Name Access –Value "SendAs";

Add-Member -InputObject $DistributionGroup –MemberType NoteProperty –Name Members –Value $Members;

#Add to object array..

$DistributionGroups += $DistributionGroup;

Write-Output ("");

}

#Counters.

$SharedMailboxCounter = 1;

$ResourceCounter = 1;

$DistributionGroupCounter = 1;

#Exchange Online - Shared Mailboxes - Add Members.

Foreach($SharedMailbox in $SharedMailboxes)

{

Write-Output("########## - Shared Mailbox - " + $SharedMailbox.Mailbox + " (" + $SharedMailboxCounter + "/" + $SharedMailboxes.Count + ") - Members - Start ##########");

#If members is not empty.

If($SharedMailbox.Members -ne $null)

{

#Grant Send Behalf To.

If($SharedMailbox.Access -eq "GrantSendOnBehalfTo")

{

Write-Output($SharedMailbox.Mailbox + ": Adding 'GrantSendOnBehalfTo'.");

#Set permissions.

Get-OnlineMailbox -Identity $SharedMailbox.Mailbox | Set-OnlineMailbox -GrantSendOnBehalfTo @{add=$SharedMailbox.Members};

}

#Full Access.

ElseIf($SharedMailbox.Access -eq "FullAccess")

{

#Foreach member.

Foreach($Member in $SharedMailbox.Members)

{

Write-Output($SharedMailbox.Mailbox + ": Adding 'FullAccess' to user '" + $Member + "'.");

#Set permissions.

Get-OnlineMailbox -Identity $SharedMailbox.Mailbox | Add-OnlineMailboxPermission -AccessRights FullAccess -User (($Member).ToString());

}

#Full Access.

ElseIf($SharedMailbox.Access -eq "SendAs")

{

#Foreach member.

Foreach($Member in $SharedMailbox.Members)

{

Write-Output($SharedMailbox.Mailbox + ": Adding 'SendAs' to user '" + $Member + "'.");

#Set permissions.

Get-OnlineMailbox -Identity $SharedMailbox.Mailbox | Add-OnlineRecipientPermission -Trustee (($Member).ToString()) -AccessRights SendAs -Confirm:$false;

}

Write-Output("########## - Shared Mailbox - " + $SharedMailbox.Mailbox + " (" + $SharedMailboxCounter + "/" + $SharedMailboxes.Count + ") - Members - End ##########");

Write-Output("");

#Add to counter.

$SharedMailboxCounter++;

}

#Exchange Online - Resources - Add Members.

Foreach($Resource in $Resources)

{

Write-Output("########## - Resource - " + $Resource.Mailbox + " (" + $ResourceCounter + "/" + $Resources.Count + ") - Members - Start ##########");

#If members is not empty.

If($Resource.Members -ne $null)

{

#Grant Send Behalf To.

If($Resource.Access -eq "GrantSendOnBehalfTo")

{

Write-Output ($Resource.Mailbox + ": Adding 'GrantSendOnBehalfTo'.");

#Set permissions.

Get-OnlineMailbox -Identity $Resource.Mailbox | Set-OnlineMailbox -GrantSendOnBehalfTo @{add=$Resource.Members};

}

#Full Access.

ElseIf($Resource.Access -eq "FullAccess")

{

#Foreach member.

Foreach($Member in $Resource.Members)

{

Write-Output($Resource.Mailbox + ": Adding 'FullAccess' to user '" + $Member + "'.");

#Set permissions.

Get-OnlineMailbox -Identity $Resource.Mailbox | Add-OnlineMailboxPermission -AccessRights FullAccess -User (($Member).ToString());

}

#Full Access.

ElseIf($Resource.Access -eq "SendAs")

{

#Foreach member.

Foreach($Member in $Resource.Members)

{

Write-Output($Resource.Mailbox + ": Adding 'SendAs' to user '" + $Member + "'.");

#Set permissions.

Get-OnlineMailbox -Identity $Resource.Mailbox | Add-OnlineRecipientPermission -Trustee (($Member).ToString()) -AccessRights SendAs -Confirm:$false;

}

Write-Output("########## - Resource - " + $Resource.Mailbox + " (" + $ResourceCounter + "/" + $Resources.Count + ") - Members - End ##########");

Write-Output("");

#Add to counter.

$ResourceCounter++;

}

#Exchange Online - Distribution Group - Add Members.

Foreach($Distributiongroup in $Distributiongroups)

{

Write-Output("########## - Distribution Group - " + $Distributiongroup.Mailbox + " (" + $DistributionGroupCounter + "/" + $DistributionGroups.Count + ") - Members - Start ##########");

#If members is not empty.

If($Distributiongroup.Members -ne $null)

{

#Grant Send Behalf To.

If($Distributiongroup.Access -eq "GrantSendOnBehalfTo")

{

Write-Output ($Distributiongroup.Mailbox + ": Adding 'GrantSendOnBehalfTo'.");

#If the group is on prem.

If($Distributiongroup.Access -eq "OnPrem")

{

#Set permissions.

Get-DistributionGroup $Distributiongroup.Mailbox | Set-DistributionGroup -GrantSendOnBehalfTo @{add=$Distributiongroup.Members};

}

ElseIf($Distributiongroup.Access -eq "Office365")

{

#Set permissions.

Get-OnlineDistributionGroup $Distributiongroup.Mailbox | Set-OnlineDistributionGroup -GrantSendOnBehalfTo @{add=$Distributiongroup.Members};

}

#Full Access.

ElseIf($Distributiongroup.Access -eq "SendAs")

{

#Foreach member.

Foreach($Member in $Distributiongroup.Members)

{

Write-Output($Distributiongroup.Mailbox + ": Adding 'SendAs' to user '" + $Member + "'.");

#If the group is on prem.

If($Distributiongroup.Access -eq "OnPrem")

{

#Set permissions.

Get-DistributionGroup -Identity $Distributiongroup.Mailbox | Add-ADPermission -User $Member -ExtendedRights "Send-As" -Confirm:$false;

}

ElseIf($Distributiongroup.Access -eq "Office365")

{

#Set permissions.

Get-OnlineDistributionGroup -Identity $Distributiongroup.Mailbox | Add-OnlineRecipientPermission -Trustee (($Member).ToString()) -AccessRights SendAs -Confirm:$false;

}

#Member.

ElseIf($Distributiongroup.Access -eq "Member")

{

#Foreach member.

Foreach($Member in $Distributiongroup.Members)

{

Write-Output($Distributiongroup.Mailbox + ": Adding 'member' to user '" + $Member + "'.");

#If the group is on prem.

If($Distributiongroup.Access -eq "OnPrem")

{

#Set permissions.

Get-DistributionGroup -Identity $Distributiongroup.Mailbox | Add-DistributionGroupMember -Member (($Member).ToString());

}

ElseIf($Distributiongroup.Access -eq "Office365")

{

#Set permissions.

Get-OnlineDistributionGroup -Identity $Distributiongroup.Mailbox | Add-OnlineDistributionGroupMember -Member (($Member).ToString());

}

Write-Output("########## - Distribution Group - " + $Distributiongroup.Mailbox + " (" + $DistributionGroupCounter + "/" + $DistributionGroups.Count + ") - Members - End ##########");

Write-Output("");

#Add to counter.

$ResourceCounter++;

}

############### Main - End ###############

#endregion

#region begin finalize

############### Finalize - Start ###############

#Remove sessions.

Remove-PSSession -Session $SessionExchangeOnline;

############### Finalize - End ###############

#endregion

About Alex Ø. T. Hansen

Experienced advanced operations engineer with a demonstrated history of working in the information technology and services industry. Skilled in Windows Server, Azure, Ethical Hacking, Office 365, Exchange, Jenkins, SCCM, Octopus Deploy and PowerShell to name a few. Strong engineering professional with a big passion for knowledge.

1 Comments

Marcel

25/02/2021 at 09:55

Hi,
Thanks for sharing your nice script!
I have an on-prem exchange and would like explicitly add permissions to shared mailboxes to users that now have permissions through groups and nested groups.
I Looked trough the script but I only see references to online shared mailboxes, not on-prem.
Am i missing something here?
Thanks for your reply

Exchange – Add nested group recipients to parent resources

1 Comments

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