Hello - we're running on Exchange 2003 and will be migrating all mail to a new Exchange 2010 server this weekend. Does anyone know if there's a way to COPY my 2003 mailboxes over to my new 2010 server, without moving them? I see instructions for moving, but not copying. I assume a mailbox can only reside in one database at a time within a single organization? If I have to move them, is it simply a matter fo moving them back to 2003 database, if something goes wrong and I need more time to regroup on the migration?