My company has several dozen computers running QNX Windows 4.25 as the embedded OS under our control software. I have to work with it every single day. It's not pretty but it works. I don't know that the OS has ever actually failed. The hard drives and motherboards give out before the software. I personally think opensource on this is more of a win for the consumers, because the developers just don't care, any more.

I will also admit that all of our new systems run Windows XP Embedded. Yeah, I designed and built a better system. That was me.