Google has sent a cease and desist letter to Microsoft to pull the YouTube app off of the Windows Phone Store and disable existing copies on consumers’ devices by May 22.

The request comes due to the app violating the terms of service for YouTube, which Google CEO Larry Page made specific note of during his presentation at the Google I/O keynote. He was quoted by Wired stating that Microsoft was “milking off” of Google’s innovations.

A few key points from the letter outline this claim; (1) allows users to download videos from YouTube; (2) prevents the display of advertisements in YouTube video playbacks; and (3) plays videos that our partners have restricted from playback on certain platforms (e.g., mobile devices with limited feature sets) These features directly harm our content creators and clearly violate our Terms of Service.

Below is the full 'cease and desist' letter from Scribd.

Google MSFT C&D