They're stats to die for: 90-plus percent market share, 80 percent profit margins, a stock price that skyrocketed so high over the years that it created thousands of millionaires in the Seattle area alone. But those figures also lay out Microsoft Corp.'s biggest challenge for the future: Just what is a monopolist to do next? As growth slows for Microsoft's main products, the Redmond software company has been aggressively expanding into new realms, investing billions in everything from selling video-game consoles to loaning small businesses money to buy its software.
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