I HAVE A 2003 SERVER RUNNING EXCHANGE 2003 ON A POWEREDGE 600SC AND HAVE STARTED MOVING IT TO A POWEREDGE 2550 WITH RAID5. What has been done so far is. dcpromo the new 2003 box. installed exchange 2003. moved mail boxes over. moved all 5 fsmo roles and cheacked the new box to be a global catalog. I have did a sync on exchange public folders. I can shut down the old 2003 box and everything looks like it is working fine untill you try and have a client pc join the domain. (states it cannot find a domain controller.) Or if a user in AD trys to log onto a box they have never logged on to before fails. Also if you reboot the new 2003 server with the old one off the exchange system attendant fails to load and therefore the information store does not load. but I have been able to start them manually. I seem to think I have a AD problem of some sort. So in short both servers are needed to run for everything to work fine. But I need to pull the 600sc out of production.