Yahoo! has started transferring the back-end technology behind its organic search to Microsoft's Bing platform.
Under the companies' Search Alliance agreement, Yahoo!'s natural and paid search engine marketing services will be integrated into adCenter.
A blog posting from the company said switching organic search across to Bing marks an "important step" towards its goal of improving the relevance of its results and building a larger audience for ads displayed on Yahoo! Search.
Last month, marketers were issued with tips to prepare for the changeover. They included testing organic rankings for both Yahoo! and Bing to find the best performing keywords and using Microsoft's webmaster tools to optimise sites for its platform crawler.
Yahoo! also said it has started testing the transition process for pay per click marketing on a limit number of accounts.
Once this is complete, users of its paid search services will be able to access a portal offering a step-by-step guide to switching to adCenter.
All advertisers are expected to be moved to Microsoft's platforms by early 2012.
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