I'm not saying/did not say Windows is so bad (it was, from a stability standpoint, horrible, but that's a while ago; still people used it then for theses purposes as well...); I was wondering why it's so one-sided. There seem to be little tech reasons to choose one OS over the other currently, so like everyone says, it must be support. But that's moot now as well.

The 'bad' thing now about Windows (and iOS, OS X) I can think of technically at this moment is that it is closed. I would not like to run my company on something closed, especially if there are nuclear reactors, missiles, airports, airplanes, medical crap involved. I want to be able to dive down to the line of code instead of having to ask a vendor why it does what it does. So again, from a tech point of view, I do not understand why any CTO would pick a closed solution over an open, especially when lives are at stake besides him/her covering his/her ass. And that's probably what it usually is; no balls to pick the best thing for humanity (...) even if it's an uphill battle.