alecstilleyedye said:...(...IT like them because they're cheap and keep IT people in jobs).
I don't really believe that either. They can be cheap to buy, but not to support in the long term. And while it's true that lots of people make good money fixing dodgy Windows machines, a lot of those problems are caused by incompetent users.
Furthermore, alternative operating systems are by no means flawless. If the dominant platform in the world were Linux or OS X instead of Windows, there would still be problems for IT bods to fix. There might be fewer of them, and they would certainly be different problems, but they would by no means disappear.