We have cluster A (two exchange 2003 servers) and a all together separated cluster B (two exchange 2007 servers). We also have two AD running Windows Server 2003. We want to move all of our exchange stuff (information stores, mailboxes, etc&) to the new cluster running Exchange 2007. Now I would like to know ALL the things I need to check before I move the storage groups and the easiest and safest way to do this. If I left anything out or you need to know, I will add. All servers are running Windows Server 2003, the newer boxes have a 64 bit version of Exchange 2007.