Microsoft's Bing overtakes Yahoo as No. 2 U.S. search engine

Microsoft Corp.'s Bing overtook Yahoo! Inc. last month for the first time as the No. 2 search- engine provider in the U.S., according to Nielsen Co.

Bing had 13.9 percent of searches, while Yahoo had 13.1 percent, Nielsen said in an e-mailed statement. Google remained in first place with 65 percent.

Microsoft and Yahoo, trying to expand search-based advertising revenue, have teamed up to take on Google. Under their 10-year deal, Yahoo plans to use Bing's search technology on its sites. The U.S. search-ad market may grow 16 percent this year, faster than the broader online advertising market, which is estimated to expand 11 percent to $25.1 billion, according to EMarketer Inc. in New York.

Microsoft, based in Redmond, Washington, rose 2 cents to $25.13 at 11:09 a.m. New York time on the Nasdaq Stock Market. Yahoo, based in Sunnyvale, California, dropped 9 cents to $13.64. Mountain View, California-based Google rose $1.68 to $483.95.