Earlier this year, Yahoo execs complained of shortcomings of Microsoft's adCenter advertising platform negatively affecting the company's financial results. But during Yahoo's Q3 2011 earnings call on October 18, Yahoo officials said problems were diminishing. Nonetheless, in order to "create more financial certainty," Microsoft and Yahoo agreed to extend the current revenue-per-search (RPS) guarantee upon which the two agreed in 2009 as part of their overarching search partnership. Yahoo execs said today that by the end of the company's third quarter, Yahoo had closed "nearly 30 percent of the RPS gap that existed in April 2011. The pair are working to close the remaining gap "as quickly as possible." "Both companies remain fully committed to the success of our Search alliance and the RPS guarantee extension represents an important sign of that commitment," said Yahoo Chief Financial Officer (and acting CEO) Tim Morse.