Exchange 2003 Standard current SP's and Patches on Windows 2003 Standard SP1 with same. Current Scenario: Single front-end server Single Back-end server We are migrating to new hardware on the back-end, during this process I will be taking my time and testing throughout. In the first Phase of deployment of the new exchange server, I will move five mailboxes including my own to the new server (The "Eat your own dog food" applies here). My question is: Will the front-end server know that these five mailboxes no longer exist on the old server and re-direct to the new server? I think it will with the DSAccess service, but haven't done this and want to see what others have experienced. Since I will do this slowly and in Phase's, I want to make sure that OWA will still function during the migration. During the migration we will end up with a single front-end server and two back-end servers in the same routing group. This will disappear in the midterm and we will end up back in a single front-end and single back-end topology. I've read the "Front-End and Back-End Server topology Guide for Microsoft Exchange Server 2003" and it's a little vague on this scenario. Any input would be appreciated! Mike French Acclaim Networks 754 Port America Place Suite 150 Grapevine, TX 76051 (888) 327-5647 (817) 488-1030 x104 FAX (817) 488-1103 <mailto:Mike.French@acclai> Mike.French@xxxxxxxxxxxxxxxxxxx <mailto:Mike.French@xxxxxxxxxxxxxxxxxxx> www.acclaimnetworks.com <http://www.acclaimnetworks.com/>