I haven't been hearing nice things about Windows Vista. It's a resource hog and doesn't work as well XP, and why would anyone want to upgrade to something that is not as good as what we already have? Not to mention (unless this has changed), Vista was requiring an "always-on" internet connection to validate your use of it. If you have to leave your TV on all the time, then it would be just like George Orwell's 1984.
It seems that some companies are trying to entice companies to try something else. IBM, Red Hat, Novell, and Canonical are working together to come up with a Microsoft-free package that will be less expensive than Vista.
Check it out here at Techtarget.com: IBM, Friends Push 'Microsoft-free' World