Xbox to Integrate Windows 10 Functionality & Vice Versa

Microsoft have announced that their new PC OS, Windows 10, will have much closer integration with it's Xbox brethren than any OS before it.
First up, Windows 10 will have a built-in 'Xbox on Windows 10' app which features many of the functions you'll be used to by now if you own an Xbox One such as management of your friends list, achievements etc. However the most exciting new aspect of this app is it's ability to stream Xbox One games to your PC or Windows tablet. Microsoft have also announced that the upcoming Fable Legends will be coming to Windows 10 day-and-date with the Xbox One version, and that PC players will be able to play the game's multiplayer with Xbox players.
If you want to see the full list of functionalities then hop on right over here.
Similarly Microsoft also revealed that a Windows 10 app would be coming to Xbox One, although they said comparatively little about what features it will have. All we got was a wry comment from Xbox's Phil Spencer that "we won't see people using Excel on the Xbox". Wont we, Phil? Wont we?