Get-DistributionGroup | Sort -Property DisplayName | foreach {
$grp = $_.DisplayName
Get-DistributionGroupMember $grp | Sort -Property DisplayName | Select DisplayName, Alias, Department | foreach {
$user = $_.displayname
$out = $user + "," + $_.Alias + "," + $_.Department + "," + $grp
$out
}
}