The following video is part of this week's MarketFoolery podcast, in which hosts Chris Hill, Charly Travers, and Joe Magyer discuss the latest business news. Microsoft made headlines by investing $300 million in Barnes & Noble's Nook, e-book, and college text businesses. So how worried should Apple and Amazon be? In this segment the guys analyze what the deal means for both Microsoft and B&N, as well as discuss how strong a threat the Microsoft-backed Nook presents in the tablet wars.

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