I have an existing Unity 4.04sp1 UM installation with Failover. Unity is currently integrated with Exchange 2000. We have stood up a new Exchange 2003 environment (Same forest) and wish to re-home Unity to the new Exchange server. I have read that I need to re-run the latest permission wizard prior to running the mailstore configuration wizard. My question is this. Cisco has stated that once I integrate Unity with Exchange 2003 the existing UM mailboxes on Exchange 2000 will continue to funtion normally until they are migrated over to Exchange 2003. The only issue (cisco outlined) is that all new users have to be added to Exchange 2003. This makes sense to me, but I am questioning the Exchange 2000 UM users still functioning normally.