Bing is the third most popular Search Engine in the U.S., where it was used for 9.9 percent of queries in October, according to comScore. Yahoo ranked second with 18 percent and Google stood all alone in first place with 65.4 percent.

Launched in late May and supported with a broad and aggressive marketing campaign, Bing is the latest iteration of Microsoft's search engine and expectations for it are very high.A day after trumpeting various enhancements to Bing, including the beta version of an improved mapping service, Microsoft had to apologize for a widespread outage that kept the search engine offline for about 30 minutes.