As with each new windows version I always check to see all the crap they try and force on you, I disabled this straight away.
One thing that may come in handy for anyone that wants to alt tab out of the game, Alt+Enter now only works if use use the left alt tab. Alt+enter is the shortcut to switch between window mode and full screen rendering, for me in AC I always go back t window mode if I alt tab out and so this was a combination I used quite a bit. I was shocked when it wasn't working as I use the right alt because its closer to the enter button and I do such tricky combos one handed.
Another thing I noticed was when I first installed it it was running like crap and I had to drop the res in AC, I checked and it was using twice as much VRAM as it should but still looked like lower quality rendering. I found that it didn't auto activate saying please try again later, searching google there were reports of the activation servers being down in some areas and quite likely in some way linked to this network sharing rubbish. The next day when it activated all ran great and seems better then in earlier windows.