Changing Domains and Exchange

I understand that thinking. Our main reason is downtime. SVR2 is newer and excellent hardware that we plan to keep a couple more years. But, clients can't deal with any downtime these days. We're trying to limit the downtime using the method I described. The SVR1 hardware is the one we are replacing this round. The SVR1 server runs all of the virtual systems currently and needs more power and resources. In order to properly move this client forward, we have to change that old "overdue" "business,local" domain name. You make a valid point and I was looking at that Server software. Perhaps we could virtualize the current Exchange Server on other hardware and then reload the exiting hardware as you suggested thus keeping downtime to minimum. Thank you for pointing me toward the Exchange group. I'm new to this site and could not find a location to post Exchange questions.