I have a Windows 2003 Server which was running on a Windows 2000 domain but the DC failed recently and is no longer functioning/available - there was no DBC in place so I now have a network with two servers, one running Win2k3 and another running Win2k8 both of which are essentially functioning as Workgroup servers for the network. I'm currently preparing a 2012 R2 Server to be a DC which I plan to add the two above servers to, and then promote the 2008 server to BDC.
My main question is, is there any issue adding a 2003 server to a 2012 domain? And, specifically, I'm currently installing AD on the 2012 server and I'm not sure what to set the forest functional level to - I'd appreciate any tips/suggestions. Thanks.