In a move aimed at bolstering the use of its Microsoft Reader program, the software giant announced on Wednesday that it would offer free downloads of e-book bestsellers over a 20-week period.

Although Microsoft has launched similar promotions in the past to boost users' familiarity with Reader and attempt to snag market share from Adobe's omnipresent Acrobat software, the new promotion is the largest in scope and duration that the company has offered, Microsoft eReading group product manager Cliff Guren said.

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