For what is believed to be the first time, Microsoft sites — primarily Bing — have surpassed Yahoo in their share of U.S. searches, according to the December 2011 U.S. search engine rankings from comScore.
In December, Microsoft sites had 15.1 percent of U.S. searches, compared with Yahoo’s 14.5 percent. In November, the two companies’ shares were almost dead even, with Microsoft at 15 percent and Yahoo at 15.1 percent.
That’s not entirely good news for Microsoft since the two companies have a partnership where Bing powers Yahoo’s searches.
Google remained dominant at 65.9 percent of the searches.
Here’s comScore’s chart: