The Zune, Microsoft's much-hyped answer to Apple's trend-setting iPod, had a good first four days of sales, says a leading research firm. But consumer electronics analysts don't think Apple has anything to worry about. The NPD Group, which tracks sales at most top retailers, says the Zune digital music device had a 9% market share in its first sales days Nov. 14-18, compared with 63% for Apple.

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