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Microsoft Corp. will invest $300 million for a minority stake in the digital business of Barnes & Noble Inc., establishing a strong valuation for the unit that makes B&N's popular Nook e-reader.

Ken deRegt will retire as head of fixed income at Morgan Stanley and be replaced by Michael Heaney and Robert Rooney. For other updates launch today's Movers & shakers slideshow.
Apax Partners offers $1.1 billion for Rue21, the same teenage fashion chain it took public in 2009. More video