I am playing with Exchange 2010 personal archive feature. I have successfully tested following: Enabled archive for one user, move a few emails into it. Then disabled archive. Enabled/Disabled archive for the same user again. Then I was able to re-connect the user back to the original archive mailbox with the messages inside. Then I got problem to remove the disconnected archive mailboxes from Exchange. Tried to remove the mailbox with command: remove-mailbox -Identity MAILBOXGUID -database -Permanent $true Got error: The operation couldn't be performed because object 'MAILBOXGUID' couldn't be found on 'exchangeServer.domain.local' I double checked the GUID it is correct, somehow Exchange cannot resolve it...

Silly me... To unhide the disconnected mailbox, simply run: clean-mailboxdatabase "Mailbox Database 112123414" Then you will be able to remove it with remove-mailbox command.