A web-client is the first step toward real corss-platform functionality, but there's no word of iOS or Android apps in the works, so it's still got a way to go to be a full-fledge player in the game. But not being imprisoned in Windows 8 is a good first step toward success.
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I always thought Xbox Music was a really bad name for this product. I mean, it just isn't about Xbox at all. If it was Xbox exclusive then of course but it just isn't.