The original claim, that "Microsoft programmers don't comment their code" was too broad, and was also said in way that I'm not surprised that others found annoying.
Any large body of code written by many people will have a variety of commenting styles, short of some effort to systematically strip comments or some other mass enforcement. One or two published examples prove little.
Since I don't work at or for Microsoft, and by his own admission, neither does gcraig, neither of us can claim knowledge of such systematic stripping. Indeed such seems unlikely to me.
First you say you don't know, but then you say it seems unlikely? Is that really logical? whadda cheap shot.