Yahoo and Microsoft moved fast as Flash (the comic book hero) and yesterday announced that, less than a week since the transition started, Yahoo! web, image, and video search on desktop and mobile in the US and Canada (English), have been moved to Microsoft's Bing platform.

With this milestone reached, both companies will move forward and continue with the transition which is planned to be completed by early 2012. The next step is the migration to adCenter which is hoped to be done this fall.

Source: Here