Det nämndes mp3 på sajten, så det kanske är formatet som erbjuds där.
Vad jag har sett så verkar de i varje fall ha den största musikkatalogen?
The Xbox Music and Xbox Video applications used in current builds of Windows 10 are to be replaced in the final version with new apps titled "Groove" for music and "Movies & TV" for video.
The Groove application keeps your music synced up with your OneDrive, including music you have purchased from iTunes, and as a result it makes accessing your music on your PC and Xbox easier.
Users can also purchase a Groove Music Pass subscription that allows for ad-free listening to any music in the Windows Store. Microsoft plans to charge $9.99 a month, or $99 a year for users to be able to stream and download any of the 40 million tracks in the catalog.
Although at first blush this sounds great for users, it's reasonable to question if it's a practical move for Microsoft, as many users could download most if not all of their favorite music within a month.