Bing Delivers Credibility to Microsoft

SAN FRANCISCO — In late May, Microsoft unveiled Bing, its new Internet search engine, in front of an audience of skeptics: technology executives and other digerati who had gathered near San Diego for an industry conference.

To that crowd, Microsoft’s efforts to take on Google and Yahoo in the search business had become something of a laughingstock, and for good reason. Microsoft’s repeated efforts to build a credible search engine had fallen flat, and the company’s market share was…