Read a few lines down: MS has a great development environment and is a great app server - I have little use for it outside of that, except as a desktop os. Still, it has it's place.
If you want to spend a small fortune license Windows to do file-and-print when you could do *nix/samba for free, well, if it works for you.....
Nothing's free, no matter how much your life revolves around finding something that supposedly is.