I've got a site with a Unity 4.2(1) server and they're close to a storage limitation on standard exchange. Their mailstore needs to go beyond 100Gb and they've added a 2003 Enterprise server to do so.
Same AD, no mailboxes moved yet. They want to stagger the mailbox moves over a week or so.
Running new Password Wizard, moving the Unity_servername account to new Exchange server, Message Store Wizard all went fine. However - before moving a user's mailbox it would take a message but not deliver it or set the MWI.
Is it possible to have one Unity server service two Exchange 2003 servers in the same AD/Domain/LAN? Do all the subscriber mailboxes have to be on one Exchange server?