Xbox Video
Xbox Video on Windows 8.1 gets MKV support
The video player that Microsoft bundles with Windows 8.1 has finally gotten support for MKV files, meaning users will no longer have to rely on third party applications for every video.
Xbox Video to be cut from WP7, Zune client and Zune devices
If you own a Windows Phone 7 device, or a Zune device and have bought content from Xbox Video, then you'd better read this.