Why Vista Failed

This is a very interesting article on why Vista has disappointed MSFT and why people are not upgrading to it in the numbers that MSFT wants.

Windows XP's end is nowhere soon, either. OEMs can ship Windows XP
through June 30, and possibly later if Microsoft grants another extension.
System builders can ship XP through the end of January 2009. There are plenty of
very good XP applications, too, and not enough native Vista apps. XP will be
competing with Vista for a long time yet, and stalling the Vista conversion
process.