According to the official release from Microsoft:
Dr. Lu will lead Microsoft’s efforts in search and online advertising and all the company’s online information and communications services. Dr. Lu will report to Microsoft Chief Executive Officer Steve Ballmer.
Dr. Lu played an instrumental role in the development of Yahoo’s search platform, which begs the question; what did Microsoft just achieve?
Is it a) why acquire Yahoo, when you can hire the guy that built its search platform? Or b) hire the guy that built Yahoo’s search platform–which has never lived up to its full potential and still lags way behind Google.
Whatever the answer, Dr. Lu will officially start work at Microsoft on January 5th.