Microsoft is committed to transparency and consumer choice in our privacy practices and has recently consolidated its advertising data retention policies for all Microsoft Advertising products: 

Microsoft will no longer retain web log data in a profile used for display advertising for more than 13 months, unless a consumer consents to a longer retention period.  Standard computer information is collected in our web logs when internet enabled features are used on our websites and online services.  Standard computer information typically includes IP address, operating system version, browser version, and regional and language settings. In some cases, it may also include hardware ID, which identifies the device manufacturer, device name, and version.  Information about a user's interactions with our sites and services may be retained and reviewed to enable Microsoft to improve its products by providing users a more personalized experience. 

This change to our data retention period is in addition to Microsoft's existing privacy protection practices.  This update has already been incorporated into our existing internal privacy standard and is being implemented across our network.  Our public privacy policy will be updated once the changes are complete.  For more information please view our privacy page.