Microsoft Advertising sets 6 cookies on websites that load its scripts. Below is the full list with purpose, expiry, and whether each one needs GDPR / ePrivacy consent.
_uetsidAdvertisingExpires: 1 dayMicrosoft Bing Ads UET (Universal Event Tracking) session cookie. Used for conversion measurement and audience building for Bing/Microsoft Ads campaigns.
_uetvidAdvertisingExpires: 13 monthsMicrosoft Bing Ads UET visitor cookie. Persistent ID used for cross-session attribution and remarketing for Microsoft Advertising.
MUIDAdvertisingExpires: 13 monthsMicrosoft user identifier set on bing.com and microsoft.com. Used for user identification, ad personalisation, and analytics across Microsoft properties — including Bing Ads on third-party sites.
SRM_BAdvertisingExpires: 13 monthsSet by bing.com to register a unique ID that identifies a returning user's device for Bing Ads remarketing.
ANONCHKAdvertisingExpires: 10 minutesUsed by Microsoft Clarity / Bing to validate analytics data and prevent fraudulent UET event submissions.
MRAdvertisingExpires: 1 weekUsed by Microsoft to indicate whether to refresh the MUID cookie. Supports Bing Ads attribution and audience syncing.