No, because a lot of people uses Linux Os or Mac Os. I'm using Vista, but that's good on it? Only few items new, and some security bugs updated.
I am wondering to read your comments because in my opinions, Vista is entirely different OS as even compared to XP. Almost all working Anti-Viruses which are perfect with XP don;t work with Vista. I think it is less vulnerable as compared to XP because there is different file systems and security.