According to Yahoo, the Yahoo Site Explorer runs only until 2012 because of the Yahoo-Microsoft search deal ( http://www.ysearchblog.com/2010/08/17/search-allia

According to Yahoo, the Yahoo Site Explorer runs only until 2012 because of the Yahoo-Microsoft search deal ( http://www.ysearchblog.com/2010/08/17/search-alliance-update-for-webmasters/ http://www.ysearchblog.com/2010/08/17/search-alliance-update... ). Open Site Explorer is the free promotion site of the commercial toolset Linkscape, so it's similar to us. Google link queries are very incomplete, that's why webmasters use other databases. In addition, we provide other tools as well.