*Source: MSNBC (
http://www.msnbc.msn.com/id/21269419/)*
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For Apple, there may be a downside to success. Sales of the Cupertino, Calif.-company's Macintosh machines are growing three times as fast as the overall PC market. Its iPod music player is burying the competition. And the stylish iPhone is setting the wireless industry on its head. But as Apple pulls in millions more customers with different kinds of products, it's getting harder to keep them all happy.
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