SEATTLE (Reuters) - U.S. shoppers woke up with mild Surface fever on Friday, lining up in moderate numbers to buy Microsoft's groundbreaking tablet computer designed to challenge Apple's iPad. The global debut of the Windows 8 operating system was greeted with pockets of enthusiasm, but not the mania reserved for some previous Apple Inc launches. Microsoft is positioning the slick new computing device, which runs a limited version of Windows and Office with a thin, click-on keyboard cover, as a perfect combination of PC and tablet that is good for work as well as entertainment. ...

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