Does anyone buy Vista by choice?
Are there really people out there who purchase Vista, by fully informed choice, more than once?
Most people are lumbered with it when they buy new hardware, get it home, find out that it's crap, ask about buying XP, and are told that it's not on sale any more, full stop. (Those of us with corporate licensing just "downgrade" to XP, but Joe Public can't do that).
What's wrong with Vista? It's slow, slow, slow. There are gazillions of other things wrong as well, but for anyone putting up with the slowness after being used to the speed of XP on 3-year-old hardware, there isn't any point mentioning anything else.
Most of these Joe Public types will buy a Mac next time, absent any other choice in the shops. Most of their friends won't make the Vista mistake in the first place.
I think that Microsoft has a lot in common with Sir Fred and fellow ex-bankers: arrogant, incompetent, believing in their own PR, and incapable of realizing just how much they have come to be loathed. If Windows 7 is not a vast improvement on Vista, Microsoft will be well on the way to the corporate graveyard.