Marketing on the WebIt looks like the transition of Yahoo to Bing for it’s advertising platform (Micro-hoo) is finally happening. In case you were not aware, Yahoo has been testing the use of Bing for its search results for several weeks. Yahoo made the full-time switch to Bing results last week (if you search on Yahoo, you now get Bing results). The date for Yahoo to start using Bing’s AdCenter platform has been less clear, but it appears now that the transition will start later this week.
see: https://www.ysmblog.com/blog/2010/08/17/important-updates-on-search-transitions/