Under the terms of a 2009 agreement, Yahoo turned over online-search promotions to Microsoft's Bing. The partnership followed months of on and off negotiations; at one point Microsoft even offered to acquire Yahoo. Finally, however, the two companies agreed to a deal whereby Yahoo got the right to sell advertisements on some Microsoft sites, plus 88% of ad revenues made on its search engine sites within the first five years of the 10-year pact. In 2010, advertisers, searchers, and Web site publishers saw the results of the partnership, as the integration between the two search engines was completed. While both search engines appear separate, they show the same results as both sites use Bing to generate results.
"This agreement does not include display ads or other areas of our business. In these areas both companies will still compete," said Carol Bartz, Yahoo CEO, at the time of the partnership announcement. "Yahoo! will continue to offer search for Yahoo! properties and users. When people search with us, it will still be prominently Yahoo! branded, as it has always been. At the bottom of the results page it will state' "Powered by Bing.'"