Uhg, the point is these are all multi-billion dollar businesses that use open source in one way or another. The problem is the open source (hacker news) community pretty much auto-ignores/dislikes anything connected with Microsoft. It's juvenile.
It's not juvenile - as a matter of fact, I'm very wary of Microsoft's moves because I remember perfectly well just how greedy and shady Microsoft has been (especially during the nineties). In comparison, Google has been a much better citizen in the developers community. It too will succumb to the problems of gigantism and the pressure of "shareholder value" in the long run, but for now you really can't compare the credibility of Google's and Microsoft's open source programs.