Script Download: GetDisconnectMailbox(PowerShell).zip
http://gallery.technet.microsoft.com/scriptcenter/Get-disconnect-mailbox-in-6ffc50a0

This PowerShell script can list of all disconnected mailboxes on your mailbox server.

As usual, the Exchange cmdlet could not easily get the disconnected mailbox, we need to Check the "DisconnectDate" from Get-MailboxStatistics. And Get-MailboxStatistics need to run one mailbox by one mailbox.
This script can list of all disconnected mailboxes on your mailbox server.

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You can find more All-In-One Script Framework script samples at http://aka.ms/onescriptingallery