With its vibrant photographs of landscapes and its image-heavy tile results, Microsoft's built-in Bing Search app provides a more attractive interface for performing Web searches than you'll find elsewhere. Unfortunately, behind the attractive facade lurks a really annoying usability problem. When you see a result you like and click on it, the Bing app sends you to Internet Explorer to view the page.
Since both Bing and IE 10 run fullscreen, some users may not notice that they have switched apps, so they'll be really confused when they hit the back button in the browser, only to find out that it does not return them to the list of Bing results. To get back where they came from, users will have to switch back to the Bing app.
The easy way to avoid this problem is to pin the Bing (or Google) websites to your Start screen and use the browser, rather than the Bing app, for all your searching needs. If you feel compelled to use the dedicated Bing app, you can dock it to the right so you can see your list of results on the side of the screen while Internet Explorer takes up most of the space.