I don't have any Unity UM upgrade experience so any help would be much appreciated.
Customer has Unity 4.0.4 UM running with Exchange 2003 witch is working fine. Customer wants to upgrade Unity to 5.x(new server) and also upgrade Exchange message store to 2007(not sure yet if new server, will find out tomorrow). I assume Unity 4.0.4 does not support Exchange 2007?
Any ides from a high level what the best upgrade approach is?