Not an exhaustive list but most noticeably
- Messaging app, not used, now Skype is central focus (not really noticed this missing!)
- Facebook and Flickr folders missing in the Photos app (I really liked this but Microsoft said it was only until dedicated Apps started to appear)
- Apps not automatically added to start screen (I hate this, I would love the ability to turn this on or off – swipe up to see all apps)
- My Computer is now “This PC” (neither a deal breaker)
Andy