I've inadvertantly connected two mailboxes to one user. Is there any way to undo it? - Removed UserA - Ran DB Cleanup With EMS - Right clicked on the disconnected user, clicked "connect" - chose existing UserB- who has a mailbox already on the system Now, UserB can see UserB's info, but not UserA. Exchange 2010 SP1 Outlook 2010 Client

Hi, >- chose existing UserB- who has a mailbox already on the system How could you choose a user who has already had a mailbox? On my test, the user who has a mailbox will not appear in the list. So your condition will not happen. When you connect a disconnected mailbox to a new user, the name of the mailbox will rename to the username. However, the value of LegacyExchangeDN is your pervious mailbox name (like /cn=UserA) You can use cmdlet below to search which user does the mailbox connect to. Get-Mailbox |where {$_.LegacyExchangeDN -like "*UserA"} Please remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.