I find it interesting that so many people point out that some sort of Windows OS WAS used by vendor A, B, or C. Yes, a lot of enterprises tried Windows in embedded use cases in the past. Presumably companies will keep trying it from time to time in the future too. But the fact of the matter is that, as the usecases nature vendors migrate to Linux. Also, saying that there were multiple parties trying to use Windows does not mean that Windows has significant market share in that domain.