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For example, for Bing search queries, we de-identify stored queries by removing the entirety of the IP address after 6 months, and cookie IDs and other cross-session identifiers after 18 months." Bing uses your search history to profile you for advertising From the Microsoft Privacy Statement [1] : "Microsoft may use data we collect to select and deliver some of the ads you see on Microsoft web properties, such as Microsoft.com, MSN and Bing."