My Unity 4.2 box has users whose mailboxes reside on several different Exchange servers. I would like to consolidate on one Exchange. How will this affect my Unity? Are any of the Exchange servers special? Or can I simple move the user mailboxes and uninstall the servers? On a related note, what is the best way to backup my Unity box? I like to use ARCserve backup with a Windows agent to backup Windows servers over the network. Will this work for a Unity server also?