Potentially, it's possible that Dr. Kai-Fu Lee, 43 has been serious concern about his futher career with Microsoft. If he had some performance review issues, for example, his management at Microsoft can fire him without any problems, but by performance reasons. Then in that situation it is very difficult for him to continue work for Microsoft under conditions of potentially being fired at any minute even if he is an outstanding researcher and inventor. The big companies usually have special HR departments and can process it without any legal consequences for them. Then, the move of Dr. Kai-Fu Lee to Google is pretty natural act of self-defence.

Oleg
http://blog.ivolva.com/?postid=13

That starwars I mean search wars logo is really cool. By the way, was that bill on the far right?

Exactly, it's Bill Gates on the right, and a lot of Search-related logos blurred in the background of the galaxy :)