At times when you delete a Mailbox in Exchange 2007, it does not show up in Disconnected Mailbox under Recipient Configuration in the Exchange Management Console (EMC). People do panic if it was a wrong deletion and they want to reconnect the Mailbox, I did too once.

Follow these steps…

• Well the first action item would be to check if the mailbox is available at all or not. Use the Get-Mailbox cmdlet. Once you get the mailbox details, then it means there is some Refresh/Update issue in EMC or Database.
• Bascially you need to run the equivalent of Run Cleanup Agent (of Exchange 2003) to make the dsiconnected mailboxes appear.  Run the Clean-MailboxDatabase cmdlet. On successful execution of this command once you goto EMC, you will see the disconnected mailboxes. 

Based upon the outcome now you can perform any of the below 2 actions

• Reconnect the Mailbox using Connect-Mailbox cmdlet or via EMC.
• Permanently delete the Mailbox using Remove-Mailbox cmdlet. You got to use the StoreMailboxIdentity parameter of Remove-Mailbox cmdlet. To get the StoreMailboxIdentity  parameter use Get-MailboxStatistics cmdlet. Look at 3rd example on Remove-Mailbox examples (at the end).

All’s well that ends well !! Enjoy !

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