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 942,268 websites that are Bing Universal Event Tracking Customers. We know of 154,536 live websites using Bing Universal Event Tracking and an additional 787,732 sites that used Bing Universal Event Tracking historically and 92,217 websites in the United States.
Get a list of 942,268 websites using Bing Universal Event Tracking which includes location information, hosting data, contact details, 997,414 currently live websites which includes 842,878 domains that redirect to sites in the list. 787,732 sites that used this technology previously and 92,217 websites in the United States currently using Bing Universal Event Tracking.