Microsoft not only has their own search engine, but they also have their own iPod named the Zune. A couple months ago, Bing, Microsoft's search engine, announced enhancements to their entertainment results, including better integration with the music results and music players.
When it’s time to buy, we’ll offer you the ability to purchase and download songs from Zune, iTunes and Amazon.com MP3.
But days after the announcement, the feature didn't work with Microsoft's own Bing and Zune.
I spotted a thread at WebmasterWorld where someone was using Bing and also using a Zune (yea, pretty rare). The person was amazed to see that he can listen and buy songs via Bing on his Zune.
But you can, here is a picture:
Forum discussion at WebmasterWorld.