Public/Get-MailboxGroupMembership.ps1
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function Get-MailboxGroupMembership { [CmdletBinding()] [Alias()] [OutputType([int])] Param ( [string[]] [Parameter(Mandatory = $true, ValueFromPipeline = $true, Position = 0)] $Identity, [string[]] [Parameter(Position = 1)] $GroupIdentity ) Begin { if ($GroupIdentity) { $Groups = foreach ($Group in $GroupIdentity) { $G = Get-DistributionGroup -Identity $Group if (-not $G) { Write-Error -Message "Could not find group '$G'" Continue } else { $G } } [pscustomobject[]]$GroupMembers = foreach ($Group in $Groups) { Write-Verbose -Message "Getting members for group '$($Group.Name)'" $Members = Get-DistributionGroupMember -Identity $Group.Name [pscustomobject]@{ GroupName = $Group.Name Members = $Members } } } else { Write-Verbose -Message "Getting all distribution groups" $Groups = Get-DistributionGroup Write-Verbose -Message "Getting members of all groups" [pscustomobject[]]$GroupMembers = foreach ($Group in $Groups) { $Members = Get-DistributionGroupMember -Identity $Group.Name [pscustomobject]@{ GroupName = $Group.Name Members = $Members } } } } Process { foreach ($User in $Identity) { $Mailbox = Get-Mailbox -Identity $User -ErrorAction SilentlyContinue if (-not $Mailbox) { Write-Error -Message "Could not find mailbox for user '$User'" Continue } Write-Verbose -Message "Found mailbox for '$User'" $UserGroups = foreach ($Group in $Groups) { foreach ($Member in $GroupMembers.Where( { $_.GroupName -eq $Group.Name }).Members | Where-Object -Property Alias -eq $Mailbox.Alias) { $Group Write-Verbose -Message "Found '$user' in '$($Group.Name)'" } } $OutputObject = [pscustomobject]@{ UserDisplayName = $Mailbox.DisplayName Mailbox = $Mailbox Groups = $UserGroups } $OutputObject } } End { } } |