Yahoo's search engine algorithm's has been merged into Bing's Search, please go through with the following information (which i found in the yahoo's site explorer site):
Quote:
With the completion of algorithmic transition to Bing, Yahoo! Search has merged Site Explorer into Bing Webmaster Tools. Webmasters should now be using the Bing Webmaster Tools to ensure that their websites continue to get high quality organic search traffic from Bing and Yahoo!.
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for more details, go to:
http://siteexplorer.search.yahoo.com/index.php