I am currently migrating from a single server running Server 2003 R2 that runs the following services: 2003 AD Domain Controller, DNS, DHCP, File and Print Sharing, Exchange 2007. I have already moved the file and print sharing to a new Server 2008 R2 VM (domain member server) and I will be running adprep (on 2003) and dcpromo on another 2008 R2 VM next week to be the first 2008 DC, additional DNS server and new DHCP server.
Once the new 2008 DC is online and everything has run for a few days to a week, I want to dcpromo down the 2003 server and remove DNS and DHCP (making it a member server) so the 2008 server is the only DC/DNS/DHCP server in the domain. Does anyone have any experience or opinion in removing the 2003 DC role from a live Exchange 2007 server?
Additionally, the role of Exchange 2007 will be moved to a separate 2008 R2 VM and a new version of Exchange in the near future as well. My thought is that having Exchange 2007 and 20?? in a coexistence scenario would be easier if the 2003 DC role is eliminated and the domain is running with only the 2008 DC with the forest/domain level at 2008.
I suppose I could dc promo up the 2008 server, move Exchange and then take down the old server's Exchange and DC role at the same time, but I would perfer to have AD as clean and final as possible before tackling the Exchange migration.
I appreciate any input.