http://www.microsoft-watch.com/article2/0,2180,1882174,00.asp
Ok not a retail product bue a very interesting internal research project.
QuoteContrary to popular opinion, Windows isn't the only operating system in which Microsoft is investing.
The Microsoft Research team has built from scratch a 300,000-line, microkernel-based operating system (OS) that has no roots in Windows.
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That OS, code-named "Singularity," is slowly but steadily gaining visibility. The Microsoft Research team behind the project recently posted to the Web a 44-page technical research report about Singularity. Company officials discussed the project publicly at the June USENIX conference. And earlier this week, Microsoft's Singularity effort got some attention on Slashdot.