Universal Event Tracking (UET) is a simple and powerful campaign measurement solution that allows you to track key conversion goals important to your business.
http://advertise.bingads.microsoft.com/en-us/universal-event-tracking
Analytics and Tracking · Conversion Optimization · Retargeting / Remarketing
Get access to data on 882,435 websites that are Bing Universal Event Tracking Customers. We know of 498,969 live websites using Bing Universal Event Tracking and an additional 383,466 sites that used Bing Universal Event Tracking historically and 301,624 websites in the United States.
Get a list of 882,435 websites using Bing Universal Event Tracking which includes location information, hosting data, contact details, 498,969 currently live websites and 383,466 sites that used this technology previously and 301,624 websites in the United States currently using Bing Universal Event Tracking.