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Windows 1.x and 2.x - Rubbish. DOS was more productive
Windows 3.x - The shape of things to come. Lots of apps and games.
Windows NT 3.x - Rubbish but stable (shape of things to come)
Windows 95 - Revolutionary. Can't say otherwise.
Windows NT 4.0 - Meh, better than NT 3.x
Windows 98 - 95 with a nicer UI
Windows ME - Tripe. Bug laden. Pretty though.
Windows 2000 - Best Microsoft OS ever.
Windows XP - 2nd best Microsoft OS ever. The fact that it's still lingering over 10 years after its release exemplifies this.
Windows Vista - Tripe. Bug laden. Pretty though.
Windows 7 - Pretty. 3rd best Microsoft OS ever.
Windows 8 - I sense a trend. From what I've used: The Start Menu cannot go. It just isn't time for it to be done with.