Has anyone got a ballpark time it would take to upgrade Unity from version 4 to 5.
I have a customer who needs to know the exact time it would take.
They have Unity 4 with failover (ie 2 servers) running on win2000 with off box message store on exchange 2000. They want to ungrade/migrate to unity 5 on win2003 and off box exchange 2007.
Anyone done something like this and how long did it take?