By Bill Rigby SEATTLE (Reuters) - Microsoft Corp's phone chief hates to call the new Nokia Lumia 521 cheap, but the lower-priced smartphone launching in the United States is the company's boldest move yet to win mass market share from leaders Apple Inc and Samsung Electronics. The world's largest software company has so far focused on putting its Windows Phone software into expensive, high-end devices - chiefly from Nokia and HTC Corp. ...



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