These, from April-- first article points to second:
Does it matter? Here's a joke: When MS sites were showing up in e.g. Netcraft as running Linux, it was just the caching & content delivery systems (forget whose) that were closer to the whole net than MS's own Windows Server systems, and they pointed out "we buy a service from someone and whatever platform they choose is not really our problem." Or something like that.
So they said/did a mature thing quite a few years ago, and it seems we could be as rational.