It was just a split between two organizations that didn't have any use for one another.
ok here's the summary:
last year, CES wanted Microsoft to sign a 3yr deal on making appearances, keynotes and all that stuff at their events. but Microsoft only made a 1yr commitment, due to the fact, the event didn't line up with their product release dates, and CES is perfectly fine with that.
so thats it, boring stuff... if this was a romantic comedy flick, it would do worse in the box office than a Nicholas Cage movie, yes that boring!!
sources: the verge