Mailbox doesn't appear on Disconnected Mailbox after disabling it

Sometimes when you disable a mailbox you click o Disconnected Mailbox and can't see the mailbox that you've just disabled.

To see the hidden disconnected mailbox run the following cmdlet on the mailbox server that hosts the mailbox:

Clean-MailboxDatabase “Database Name”

After running the cmdlet return to EMC and refresh Disconnected Mailbox, then you'll see the mailbox there.

Source:
http://exchangeshare.wordpress.com/2008/04/27/cant-see-deleted-mailbox-in-disconnected-mailbox-under-recipient-configuration/