It seems like there's a lot of people commenting here who haven't read the article in full. Some key points of it are that Microsoft isn't filing against Google Search - rather they are complaining that Google is providing meta data to other companies (apple) and are crippling Microsoft's access to it. As a result, Microsoft's Windows Phone and other devices can't build an integrated youtube app on their phone. They claim that Google is doing this because Microsoft is a search competitor.

In addition, they are filing numerous complaints against Google's ad networks, and their attempt to have unfettered and exclusive access to orphaned books.

Right now, it seems like Microsoft may have a leg to stand on in regards to the youtube metadata control. I'll await google's response to this though before I choose sides, and I'd recommend others wait as well.