I've got two W2K8 R2 SP1 servers, which I'm using as DC's. I also have a Windows Server 2003 DC. I would like to DCPROMO the W2K3 machine out of the environment, but it has come in handy. The DNS service on the W2K8 machines has, on at least one occasion, come to a complete halt, and the W2K3 server has been there as a back stop.
Can I leave it there during the installation? Will W2K12 R2 refuse to cluster with the downlevel computer.