I have an old Exchange 5.5 email server that has 100 or so mailboxes on it. I just set up a new machine with Exchange 5.5. I want to move the mailboxes over slowly, one at a time, with both servers being in production. How can I set up routing from one server to the other for my domain name such that the first server will check to see if the mailbox is local, deliver if it is, forward to 2nd server if it is not? Thanks.