Remove All Exchange 2010 Disconnected Mailboxes $mailboxes = Get-ExchangeServer | Where-Object {$_.IsMailboxServer –eq $true} | ForEach-Object { Get-MailboxStatistics –Server $_.Name | Where-Object {$_.DisconnectDate –notlike ‘’}} | select displayname, mailboxguid, database $mailboxes | ForEach { Remove-Mailbox -Database $_.Database -StoreMailboxIdentity $_.MailboxGuid -confirm:$false } --------------------------------------------------------------- Set Send on Behalf of Distribution List Set-DistributionGroup -Identity GroupName -GrantSendOnBehalfTo User1,User2 --------------------------------------------------------------- Manually Update global address book Get-GlobalAddressList | Update-GlobalAddressList --------------------------------------------------------------- Remove a distribution group Remove-DistributionGroup -Identity "GROUP ALIAS"