There's a really interesting series of articles on winsupersite.com about the development of Windows NT, from 1988 to now. Part 1 is about The Early Years, part 2 about Developing Windows, the build system and a little about the SCM (Source Code Management) they use, and, Real Soon Now™, part 3 about Windows testing.
I think it is interesting to note that David Thompson, Vice President of Windows Server Product Group, says that NT 3.50 were a very rewarding release because of lots of new things in it, 3.51 were not, because they had just fixed bugs for 9 months at that time. Says Thompson: "But because of this, NT 3.51 was a solid release, and our customers loved it." — hardly surprising, they should do that more often.
Of course we're a few enlightened persons who's cast aside the ball and chain of Microsoft and Windows, but every once in a while, in weak moments, you just might start to miss Windows. Luckily you can then refresh the Windows experience with this totally realistic Flash Windows simulator, and then relax, knowing that you've done the right thing.