Yahoo wanted to hold off switching to Microsoft technology in certain markets until Mayer had a chance to discuss the partnership with Ballmer's successor. Microsoft said that the disagreement was narrow and it had unwavering plans to continue investing in the Search Alliance, now operating in more than 20 countries.
Yahoo and Microsoft began a 10-year search partnership in 2010, before Mayer took over as Yahoo's CEO. The two companies hoped their combined efforts could mount a more competitive challenge to Google, the world's No. 1 search engine. However it didn’t work that well and Google still controls roughly two-thirds of the US search market.