Lesson: Microsoft is willing to improve their proprietary offerings using leveraging free software others built. This is the main reason for FOSS uptake everywhere and makes great business sense for them. They also make a killing in patent royalties on the Android ecosystem. If anything, Nadella is focusing Microsoft more on the dollar than prior politics. It's the same Microsoft, though, far as I can tell with many…
On the other hand, that wasn't public like this. But it's a far cry from the two tries required to replace Hotmail's front end Apache FreeBSD servers with IIS? NT a decade or so earlier. Or the much more recent Danger Hiptop/Sidekick NetBSD + Java + sane servers -> Windows CE + Exchange that in probably the largest part doomed their $1 billion Kin effort: https://en.wikipedia.org/wiki/Microsoft_Kin which took only weeks to fail hard once it hit the market.