Microsoft to debut wireless music sharing Zune in U.S.

The world's largest software maker Microsoft Corp. will start selling the Zune portable music player and the Zune Marketplace in the United States on Tuesday, hoping to take a bite out of Apple's dominant iPod and iTunes powerhouse.

The rectangular "Zune" player is similar in appearance to the iPod with a round click wheel, but is slightly bulkier with a larger, 3-inch screen.

The 30-gigabyte Zune allows the device to locate other nearby Zunes and wirelessly exchange music and pictures with a few touches of the button.

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