Well, you (and your friend) would really need to be EXPLICIT about what is compatible/incompatible.
All the Windows flavors are created by Microsoft...so they all, in some shape and form, are going to be compatible...and...in some very rare and specific ways, incompatible.
CE is a platform for handheld devices...period...and has been since I believe about 1999. So probably the only thing CE has in common with generic Windows95/98/ME/XP/Vista is the Start Menu, some graphics, and MS Office basic support.
-Eric
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