Microsoft Corp. chief executive Steve Ballmer said a deal with Yahoo Inc. may still make economic sense for shareholders of both companies, pushing Yahoo stock up 11 percent.Microsoft chief executive Steve Ballmer on Thursday defended his company?s large and so far unrewarded investment in online search and advertisingHANOVER, GERMANY - MARCH 03:  (FILE PHOTO) Microsoft CEO Steve Ballmer speaks at a press conference at the CeBIT technology fair a day before the fair's official opening on March 3, 2008 in Hanover, Germany. Microsoft dropped its $42.3 billion buyout offer to Yahoo, Inc. after failing to agree on a price May 3, 2008 in San Francisco, California.  (Photo by Sean Gallup/Getty Images) Photo: Getty Images
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