I'm not sure that Google concentrates it's lobbying efforts to say anything one way or the other about Microsoft. It seems it's biggest efforts were in trying to prevent SOPA/PIPA.
Sure, maybe Google spent a lot on lobbying in 2011, but you don't know that any of that was smearing Microsoft from behind a sock puppet in the way that they have against Google here. While I don't like lobbying, I accept that Google needs to play the game while the rules are the way they are, and they don't necessarily have to badmouth Microsoft to do that - as you admit, they have presumably focused more on SOPA.
And I don't see the huge problem with the link you present - in fact I don't think I'd call it "lobbying" at all. Google had a potentially legitimate complaint in asking that the court overseeing a convicted monopolist considers a particular part of their behaviour which obviously has the potential to impact on Google. It's up to the court to decide if they're infringing or not.
