Windows Phone 7 A Hot Seller

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InformationWeek reports that T-Mobile temporarily lists device based on Microsoft's new mobile OS as sold out.
T-Mobile's entry in the Windows Phone 7 race—the HTC HD7—was temporarily sold out Monday.

However the phone, which features a high-definition display and 16 GB of built-in memory—appeared to be back in stock as of early Tuesday.
Windows Phone 7 A Hot Seller