Well right now the home users and a few business users are crying about VISTA - just wait till Server 2008 comes out (then you can no longer buy Server 2003) THEN you're going to hear some real crying from the IT World.

Server 2008 looks, feels, and acts like VISTA - which is NOT cool to me for a Server. I suppose I'll have to start saving up my money at work and start buying 2003 Licenses while I can.
The bigger Enterprise companies on Volume License with MS won't have to worry about it as they will be able to install 2003 Server for years to come, but smaller Companies it will be difficult to get.