A week after Microsoft called for all major search engines to anonymize search data after six months, Yahoo said it would keep identifiable search data for only three months.
Currently, Microsoft keeps search data on file for 18 months, while Yahoo keeps it for 13. Google stores data for nine months, before anonymizing it. Microsoft had said it would keep users' search data for six months, but only if competitors followed its lead. Yahoo, though, did not say its move was dependent on its competitors.
Yahoo did say, however, that "in order to fight fraud and preserve system security" the company would need to keep some data in identifiable form for up to six months.
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