I am enjoying this short thread (so far!)
No boasting intended. I was very lucky to be picked out of the hat for Beta testing Vista. It was mainly through this that I achieved the doubtful MVP status.When it was released to the public, it was innovative. Navigation through its functions was a complete new learning experience.
I had, previously, joined a forum which was actively following the progress of Vista. Upon its final release, I was swamped, as a moderator, with help requests. No probs at all with the OS, only finding old functions in new places.
Its failure was due to a neglect on driver manufacturers not appreciating that radical structure changes required rewrites. Constant failure of minor, but reasonably important, hardware plagued the OS and led to its doom.
I would have stayed with it forever, but circumstance forced me forward into, what I now regard, as windows 9