Last week we showed you the native YouTube app Microsoft built for Windows Phone 8, but it appears today that Microsoft never had Google’s consent to produce the app.

Google reportedly sent Microsoft a cease and desist letter today, which The Verge has obtained, citing the lack of ads on the YouTube app for Windows Phone.

“Unfortunately, by blocking advertising and allowing downloads of videos, your application cuts off a valuable ongoing revenue source for creators, and causes harm to the thriving content ecosystem on YouTube.”

Windows Phone users will have to rely on third-party YouTube apps in the meantime until Microsoft and Google work things out.

Update: Microsoft has responded saying it is not opposed to including ads in its native YouTube for Windows Phone app, according to The Verge, but that Google does not provide the needed API.

Google is calling for Microsoft to take down its YouTube client by May 22nd so it will be interesting to see if the two companies can collaborate on a solution before then.

“In light of Larry Page’s comments today calling for more interoperability and less negativity, we look forward to solving this matter together for our mutual customers.”

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