After reading recommendations here, I've opted while upgrading hardware to add the new computer to the network as a second Exchange server, and move the mailboxes from the old to the new. The question is: what happens to Outlook Web Access for those accounts which have been moved to the new server? DNS points to the old server for the OWA connection. I'm seeing "The page cannot be displayed" when I try to access through OWA a test account that I have moved. How are other admins who are gradually moving accounts as the method of upgrade dealing with this?