Yahoo users (in the U.S. and Canada) will start seeing Bing results for organic searches this week. Yahoo and Microsoft announced that the transition is starting, and that the paid search transition is in the middle of testing. "Later this week, we will begin the work of transitioning the back-end technology for Yahoo! Search over to the Bing platform," says Yahoo . "This is an important step toward our goal of improving the overall relevance of Yahoo!