As part of the Yahoo! and Microsoft Search Alliance, from August 3, Yahoo! search results in Europe will be powered by Bing. Yahoo! will be migrating organic search results for its European properties to the Bing search index.
Organic (also referred to as algorithmic) search results are the non-paid listings found on the main body of the Yahoo! search page. This transition will happen for Yahoo UK, France, Germany, Spain, and Italy. At this time, Yahoo! is not transitioning paid search results to Microsoft Advertising adCenter and companies can continue using their Yahoo! Search Marketing accounts.
In August 2010, a similar transition happened for Yahoo.com. After the transition, there were no changes in the branding or search experience, except a Powered by BingTM‘ text in the footer of the search page.
If you are a webmaster and organic search results bring traffic to your site, you are advised to compare your organic search rankings on Yahoo! Search and Bing for the keywords that drive your business and check for any potential impact to your website traffic. You might also want to check if you need to modify your paid search campaigns. Also, if you are not using the Bing webmaster tools, it is a good idea to do that now to ensure your site is prominently listed in both Yahoo! and Bing organic search results.