Microsoft is going to continue to pay Yahoo a guarantee for the revenue-per-search (RPS) shortfall that is continuing to persist Reuters noted that Yahoo disclosed the latest year-long extension of the guarantee, which had expired on March 31, on May 7. The guarantee took effect on April 1, according to Yahoo's latest 10-Q filing.
Search Engine Land recapped RPS this way:
"(W)hen Yahoo & Microsoft signed a search deal in 2009, Microsoft promised that Yahoo would earn a set amount of money for each search that happens, a 'revenue per search' or RPS. If this didnít happen, Microsoft agreed to make up the difference, whatís called the RPS guarantee."