One of the more notable failures of MS IMHO.
It had a great concept that among other things made it much more secure than regular Windows (and why for instance it was used in ATMS)
But as with all things MS of late, died of neglect and/or fell out of fashion with the leadership in MS
And one other thing that’s often overlooked is how efficient it was, running at least acceptably on much lower level hardware than standard Windows. (we used it quite a bit early on with our custom devices)
However, that fact that it was called WINCE internally says a lot about how many at MS felt about it.
Windows CE, Microsoft’s stunted middle child, reaches end of support at 26 years | Ars Technica