Set by Microsoft Advertising's UET (Universal Event Tracking), the _uetsid cookie distinguishes users for conversion tracking and remarketing. It expires after 1 day and is classed as a marketing/advertising cookie.
How it’s used
Microsoft Advertising uses _uetsid to assign a short-lived session identifier that helps attribute conversions and build remarketing lists. It supports ad measurement and optimization and requires marketing/advertising consent.
To check for this cookie in your browser, inspect stored cookies — see How to Inspect Cookies in Your Browser. If you decline marketing cookies, _uetsid should not be placed.