It’s official: Yahoo search is now powered by Microsoft’s Bing, the end result of a deal signed a little over one year ago by the two companies.
That means that combined, Microsoft now owns 28.1% of the search market (as of July 2010’s comScore numbers), though that's still less than half of Google’s 65.8% share.
The implementation, which has been in testing for about a month, is currently live only in English and only in the U.S. and Canada, with “other languages [to] come in the weeks and months ahead,” according to a statement from Microsoft.
The change might not be immediately apparent to Yahoo users, as the search interface remains essentially the same (and the company has indicated that it will continue to make its own experience enhancements). However, you’ll notice if you look at the status bar in your browser that data is indeed being loaded from Bing.