Codename Blackcomb was internal codename first talked about in 2001 I think. It would be the succesor of Windows XP and .NET server (codename Whistler). Later Microsoft decided to create a small in between version of Windows codename Longhorn. Longhorn is a bar in the Whistler ski-resort between the mountains Whister and Blackcomb.Well we know Longhorn turned out to be a major Windows release, which is over 5 years of development. Blackcomb is still the next major release of Windows after Longhorn (Vista) but first Longhorn "R2" Windows editions will be released.Anyway, on the Channel 9 forum, Robert Scoble comments that the codename Blackcomb is changed to "Vienna"