Nielsen reports that last month, Bing overtook Yahoo! for the first time, with a search market share of 13.9 percent to Yahoo!'s 13.1 percent. Though it's definitely a win for Microsoft, we don’t imagine Yahoo! will be too upset. CEO Carol Bartz has said in the past that Yahoo! is not a search company and more recently, the company signed a deal with Microsoft that involves Microsoft technology powering Yahoo! search. Reuters reports that if you combine Bing-powered search, Microsoft accounts for 26 percent of the search market.
Google continues to lead with 65 percent of the U.S. search market.