Now that the Bing/Yahoo Search Alliance is in full effect there seems to no longer be a need for Yahoo! Site Explorer – one of the most used search engine optimization tools on the market – so Yahoo! is shutting the service down.

Yahoo transitioned the backend of its organic search to the Microsoft search platform last year to great fanfare. As Bing Webmaster Center began gaining several new functionality and features, maintaining two services apparently did not make sense so the final days for Site Explorer have finally arrived. Microsoft’s Webmaster Tools will now be the only source for Bing and Yahoo! webmaster site and analytics data.

Yahoo! indicated that it will continue to “innovate on the search experience beyond the services delivered by Microsoft” meaning their slurp crawlers will continue to selectively crawl websites.