Yes you can. I don't remember exactly if there were any major issues. For most part you loose the ability to run any applications, and you may have to re-install any published apps when you switch back. It all depends on how much you have installed that rely on Terminal Services. I use Citrix and I have switched back and forth to fix some issues, and had no problems. You may want to do some more research based on that apps you have installed... because of that whole activation carp.