Using ExMerge to recover a Single Mailbox or Mailbox Item
As already described in one of my last articles about Exchange Server 2003 you do not have to install a second Exchange Server environment in an isolated forest to restore a single mailbox or a single mailbox item. You can use the recovery storage group to restore a mailbox database onto your running Exchange Server 2003. After having done this you now have to extract the mailbox you want to recover using the ExMerge utility.