Longhorn is an Abandoned Work-in-Progress by Microsoft, before what is now known as Vista was born.

Vienna (a.k.a. Blackcomb) is the previous codename for Windows 7 - Windows 7 is what the supposed name is for the next full-fledged Windows Operating System will be

Those screen shots are 99% Fake. They are Vista Shots with tiny touch ups that were Photoshopped or added with 3rd Party Applications.

Complete, utter, bullchocolate, to put it bluntly - however, those to think that may very well be mistaken.

Not only is it a screen on Wikipedia, but on many places now.... its known as "M1" or  "Milestone 1" even "Build 6519.1" released December 20th, and, this is a much more convincing site > http://www.thinknext.net/archives/2150