Microsoft Vista has been quite a PR disaster. So many people have had what they consider a "bad experience" with it that word of mouth has spread that line out. The general assumption is that Vista sucks.
In my personal opinion that is totally true. It's eyecandy is pathetically behind OSX wehich is also way behind Compiz under Linux from what I can see for a start, but I digress.
Microsoft, realising it has a mountain to climb, has decided to run a little confidence trick on users. It has been showing them a new OS code-named Mojave which is actually Vista, and guaging their reactions to it after they said they believed Vista was rubbish. They have yet to release the formal results of thier con-trick.