We have recently upgraded from NT 4/Exch 5.5 to Win 2k3/Exch 2k3.
The old Exch 5.5 is still online but all mailboxes have been moved to the Exch 2k3 server. All incoming email is direct to the 2k3 server. All public folders are replicated.
We would now like to decomission the old 5.5 server - what steps do we need to consider? I read that we need to pay special attention to this as was the first Exchange server.