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htc-radar-mangoT-Mobile will offer the HTC Radar 4G, the carrier’s first smartphone to run the next generation of Windows Phone 7 OS, starting Nov. 2nd, the company announced today.

The Windows Phone 7 mobile operating system has an uphill battle ahead of it this holiday season, with fierce competition from the brand-new Apple iPhone 4S and Google Android devices such as the Galaxy Nexus and Motorola Droid Razr. Several research firms like IDC and Gartner have predicted strong growth for Windows Phone during the next few years, but I suspect it will have much stronger sales in the rest of the world than in the U.S., at least initially.

Still, if Microsoft and its manufacturing partners want to maintain and grow its U.S. user base, they have to keep new products coming down the pipeline. The HTC Radar 4G is one such product, and it features a 3.8-inch screen, 1-GHz Snapdragon processor, a 5-megapixel rear camera, front-facing camera for video chat, and 4G HSPA+ connectivity.

The Radar 4G will retail for $100 after a $50 mail-in rebate. (Note to carriers: Please stop with this mail-in rebate nonsense.)

Those looking for a bit more power and heft with their Windows Phone running Mango might want to look out for the dual-core HTC Titan, which is headed for AT&T. Other phones out this holiday season with Mango include the Samsung Focus S and Samsung Focus Flash.

Will you purchase a Windows Phone 7 device this holiday season?

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