Apotheker had strategic skills but was a flawed manager. His ability to understand customers' needs propelled him to the top of SAP before he was ousted, in part for his obstinacy. At HP, Apotheker saw the need for a major transformation -- unloading its PC business -- but he was undone by mistakes, bad financial results, poor relations with top executives, and a board that didn't stand by him.
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Exxon Mobil knocks Wal-Mart from the top spot. Who else made the top 50 this year?