I have a Windows 2008 domain & all of my domain controllers are Windows 2008. Currently the domain functional level is Windows 2003. I'm in the process of setting up DFS in this domain but before I start using DFS I'd like to raise the domain functional level to Window 2008. My question is, when I raise the functional level to Win 2008, do I need to do this to all of my domain controllers or just on one of them? Or do I need to make this change on the RID operations master or which FSMO role holder should I make the change on? Any suggestions or comments are welcome.