Yahoo shares fall 15 pct after Microsoft withdraws bid

In this Jan. 7, 2008 file photo of Yahoo CEO Jerry Yang gestures in the Yahoo booth after he gave his keynote address at the Consumer Electronics Show (CES) in Las Vegas. Yahoo shares fell 17 percent in early trading Monday as hopes for the once-dominant search engine dimmed following Microsoft's withdrawal of a $47.5 billion takeover bid. (AP Photo/Paul Sakuma)