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Mr. Forstall, a 15-year Apple veteran, ran one of the company's most prominent groups—its mobile software unit—and was one of its most important executives. The name of Mr. Forstall, a protégé of Mr. Jobs, was once bandied about as a possible successor. He rose quickly at the company and earned a reputation for risk taking. But he was also known as difficult to work with, and "never fit into the culture of Apple," said one person familiar with the matter.
Apple Inc. executive Scott Forstall was asked to leave the company after he refused to sign his name to a letter apologizing for shortcomings in Apple's new mapping service, according to people familiar with the matter.