Google's market share for Web search in the U.S. rose in February to 58.7 percent, up from January and the same period a year ago, while Yahoo's, at 17.6 percent, was down compared with the same periods, according to data released Wednesday by Nielsen.
In January, Google had 56.9 percent share and Yahoo had 19 percent share. A year ago, Google's share was 55.8 percent and Yahoo's was 20.7 percent.
February share at MSN/Windows Live Search was 11.2 percent, up from 9.6 percent a year ago but down slightly from 12.1 percent in January.
Meanwhile, AOL was at 5.2 percent, up from the month before but about flat with a year ago; and Ask at 2.5 percent was flat with January and slightly up from a year ago.
The trends are similar to those--which had Google's U.S. search share rising to 59.2 percent in February; Yahoo's and Microsoft's slipping to 21.6 percent and 9.6 percent, respectively; and AOL and Ask.com flat at 4.9 percent and 4.6 percent, respectively.