XP, Vista, mac... WHY if you can have GNU/Linux ? Every one can use GNU/Linux, it cost from about $0, so even if you are poor as I am, you can get it! Microsoft Windows is really expensive, even if perhaps you think it's free because some swindlers force you to buy it when you buy a computer. In addition, a lot of people prefer use GNU/Linux which is more effective and easier to use. After try it, they can't imagine to use Windows again. I don't understand why people like you don't want to let people using the software they want...