Security is main concern for microsoft coorporation. Since windows Xp sp 2, it included firewalls on its product, even though in sp 1 windows had used firewalls even must be set manually. After launch windows 7, microsoft introduce anti virus which have a life time lisence. But microsoft sometimes could not educate user well, for example in windows 7 there is suggestion when entering the hot spot area to push the button on the router. Can you imagine if your staff do this at your office?