Why wouldn't it count as key contributions? Windows has market share of 95% on desktops and almost 50% on servers (used more on internal servers like exchange than your typical apache+centos cheapo host). Still, MS works to maintain some compatibility when they really have no reason to. I think that deserves some appreciation.

Microsoft has always been one of the best innovators about new technology. Against the popular belief on Slashdot, they have contributed a lot to computer technology, innovations, and of course, Linux too. Stop the hate and accept that Microsoft also has many technically knowledgeable persons who also contribute to Linux. When reading this hate about MS I can't but think that YOU are who is having problems with dealing with it.