Microsoft Chief Executive Officer Steve Ballmer speaks during a luncheon and conference on technology and innovation in Madrid April 25, 2008.


"If we could have one do-over I would probably say I would start sooner on search," said Ballmer. "Sometimes the error you make is what you don't do and don't see. Our mistake wasn't that we didn't see the technology change coming, we didn't see the business change coming."
Shares of Microsoft closed down 0.8 percent at $23.50 on Nasdaq.
(Reporting by Ian Sherr; Writing by Edwin Chan and Bill Rigby; Editing by Tim Dobbyn and Richard Chang)