We have a remote office that has grown a bit and it was decided to send them a server that was also a DC so that they can start administering themselves in the office. Since the server will also be doing back-ups and such the admin onsite would need Domain Admin permissions so instead of giving him full access to the entire domain we have created a child domain for the location and giving him Domain Admin rights to the child domain. Is there a way to move all of the users accounts in that office to the new domain and keep all of their mail settings and group settings or am I going to have to recreate all of the users and get rid of their old accounts? If I have to delete and recreate the accounts can I re-associate the new account to their Exchange Mailbox?