转载自：[url]http://msmvps.com/blogs/andersonpatricio/archive/2007/10/08/removing-disconnected-mailboxes-in-exchange-server-2007.aspx[/url]


      Exchange Server 2007 doesn't allow us to purge the disconnected mailbox. In order to remove one or multiple disconnected mailboxes we can be performing these steps:
      Listing all disconnected mailboxes
      Get-MailboxStatistics | where-object { $_.DisconnectDate -ne $null } | Select DisplayName,MailboxGuid
      Removing a single entry
      Remove-Mailbox -Database <Database-Name> -StoreMailboxIdentity <MailboxGuid> -confirm:$false
      Removing all users at the same time
      $users = Get-MailboxStatistics | where-object { $_.DisconnectDate -ne $null } | Select DisplayName,MailboxGuid

      Now that we have all disconnected mailboxes in a var, we can run the following cmdlet to remove all of them:
      $users | ForEach { Remove-Mailbox -Database "Mailbox Database" -StoreMailboxIdentity $_.MailboxGuid -confirm:$false }

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      Daniel said:
      Just a little improvment to remove on all databases of the server:
      $users = Get-MailboxStatistics | where-object { $_.DisconnectDate -ne $null } | Select DisplayName,MailboxGuid,Database
$users | ForEach { Remove-Mailbox -Database $_.Database -StoreMailboxIdentity $_.MailboxGuid -confirm:$false }