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Give me a break, MS has always played the fast follower game which means they will ride on the work and investment done by the market leader and it's worked out well for them in other parts of their business.

Using signals from user behavior on the toolbar on ANY search engine seems to make a lot of sense when it comes to improving search results. MS employees are the biggest QA group for Bing. Internal tools allow employees to tag queries and results that are superior/inferior to Google. Both are displayed side by side and employees provide active feedback to help improve the algorithm and identify more systemic underlying ranking issues.

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