Vista shouldn't be #1. Although initial acceptance was bad Microsoft managed to get into our lives by force. Most recent polls mention that Vista may be at 25% of the Microsoft computer market share. It has been out for 2 years so it can be deemed a failure. But that seems a far cry from a failure. I almost think this is the sort of adoption that is going to occur if Microsoft releases a new version every 2 years.
I agree with the thought that bluetooth adoption is slow. I don't know why every single MP3 player doesn't offer it and why stereo headsets are dropping below the $100.00 mark (in Canada at least). It's also not a common feature in cell phones yet when supporting the more advanced features like a2p2 (I think that's right) or stereo.
I'm not sure what people consider a failure. If they consider Zune to be a failure then I only wish I could come out with products that would fail like that. Apple owns the mark and it will be a very long time for anyone to top them. But the Zune selling millions in a few years (only in North America because I don't think it's sold elsewhere) is a success story. Maybe the publisher would have been happier if it wasn't branded as a Microsoft product, maybe that would make them see the light of day.