We are currently replacing all 2003 DCs with 2012 DCs. I noticed that the old servers are still showing in the AD sites. Should these be cleaned up and how? Why didn't they get removed when I demoted the 2003 DCs? What is your recommendation for cleaning the AD sites?
Also, since we also be further decommissioning 2003 servers by disjoining them (now the member server) from the domain and shutting them down, would that process delete them from AD sites? Now they are just member server without AD installed and they are still showing up in AD sites.