Working With Disconnected Mailbox Exchange 2013

A mailbox gets disconnected when it is no longer associated with an account in Active Directory (AD). By default, the time for retaining the disconnected mailbox is 30 days. After the time period is over the mailbox will purged from the system. During this retention period mailbox can be reconnected to a valid Active Directory account using the Connect-Mailbox cmdlet or Connect Mailbox Wizard from EAC. This allows you to clean up from accidental user deletion.