Hard times are upon the world economy, and of course that means companies and individuals are not rushing out to get new computers or software. If its working fine and you are reasonably uptodate - why change it? For PC users this means maybe skipping Vista altogether and waiting for Windows 7. Loyal supporters of XP never did move to Vista, or after trying Vista rolled back. As for me - I have one computer with Vista and one with XP and have no problems moving from one to the other.
Which begs the question now that Microsoft is cutting back on 5000 jobs. Is the poor reception of Vista partly responsible? Or is it just that everybody is buying fewer computers and therefore fewer software upgrades?