Because?? ok so microsoft are gonna release a big patch cause their OS is so buggy, that doesnt mean you should believe that their SP will not be buggy either. people are so gullible. Its marketing.
What is so buggy? I have had no big problems with Vista. In fact, Vista has not once crashed on me. And if an APP freezes, the task manager reacts INSTANTLY. In XP, there was a good chance your task manager wouldn't pop up or do anything when you tried to kill an APP.
I'll go as far to say Microsoft has the best damned software engineers. Linux as a desktop platform with bleeding edge hardware is a joke. You can't even get a nice 7 button mouse to work properly, let alone most sound cards or power applications. As for Mac, they are having their own share of problems with Leopard. Mac should have very few if any problems, seeing as how they develop on a closed platform.