When the migration of an Active Directory user object is undone in Quest Migration Manager for Active Directory (QMMAD), what happens to the mailbox associated with the user object that was created with Quest Migration Manager for Exchange (QMMEx)?
The mailbox is deleted from the target exchange server along with the user object from the target AD.
If the mailbox has been switched then it will not be deleted. Please see solution SOL58087 - When undoing a migration nothing happens, migration is not undone and target user remains unchanged - https://support.quest.com/Search/SolutionDetailPrintView.aspx?id=SOL58087 for more information on this subject.
Please see the following solution(s):