Very rarely is Microsoft heard of going after individuals who pirate. In fact, I've only ever heard of them pursuing companies. Not this time
, though, and a group of individuals who were selling pirated software on eBay ended up getting caught, largely due to the people purchasing them getting tagged by Microsoft's Genuine Advantage software. Complaints against the culprits were sent to Microsoft's antipiracy hotline, and now Microsoft is taking the issue to court.