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Microsoft Corp. dove headlong into the burgeoning enterprise social networking market Monday, June 25, announcing a $1.2 billion cash agreement to acquire Yammer Inc.

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