We have three Exchange 2003 SP2 servers. Two are back end one is a front end. Almost three years ago, we had only a front end and back end server. Our office was moving so we brought a third server online to deliver mail to the new location as we moved. Once that was completed, we turned the server off.
During the time it's been off we've upgraded our domain from W2K to W2K8.
Now we are ready to move to Exchange 2007. My question is this, can we turn on the dormant Exchange 2003 server, have it touch the network and after a couple of hours attempt to un-install Exchange from it? Seems it would be better to attempt a graceful un-install rather than rip it out of AD.
However I wanted to see if others have had to make this choice and if there are any potential "gotchas" to having the old server back online.
Thanks in advance.