For example, Zeiss Microscopes control panels from 2006 use Windows CE. I am not sure what the advantage is today. GCC competes well with VS and more people know Qt.
MS can give this away for free as it isn't a market that they own.
And PocketPC could do almost everything an iPhone could do about... 5-6 years before the iPhone came out. Windows CE was clearly ahead of its time, but the support from Microsoft was terrible: they kept it low-key, too long.
I had a top-of-the-line PocketPC phone for three years. Saying a PocketPC could do almost everything an iPhone could do is like saying that a nail file could do almost everything a Haas CNC machine could do.
In 2007 Apple released a phone that could only run web-apps without hardware support. At the time this got a big meh from me since it looked like a toy compared to my phone.
Even if they slash license prices by a huge amount, I can't see MS giving them away for single digit prices.