I have an Exchange 2003 server which I am migrating to Exchange 2007. I have built the 2007 server and it is working correctly. I have moved a few mailboxes and email is flowing correctly.
My plan now is to swap the IP addresses on both Exchange servers, so that the new Exchange 2007 server has the old Exchange 2003 server IP. I will then check that DNS is correct. Once this is done, then I will migrate the rest of the mailboxes and eventually decommission the 2003 server.
Does anybody know if this should be OK to do or is there anything I need to consider beforehand?
I want to change the IP's so that I don't have to make any config changes to my email gateway, routing, firewall rules or public DNS settings.