Microsoft fined -- crazy?

Microsoft got a 270 million euro fine. Umm... seems strange that EU can fine a largely American company. I mean if you think about it, they really should fine Microsoft as much as possible if they are allowed to. After all, it's money coming straight from USA to EU's coffers. Let's fine every American company to their full worth and EU will definitely become the superpower of superpowers! I'm sure we can find something to accuse them of.