Microsoft buys enterprise-oriented social startup Yammer for $1.2 billion

http://en.wikipedia.org/wiki/Yammer

Microsoft has announced the $1.2 billion purchase of Yammer, the social network aimed at enterprise users. Yammer will become part of the Office division, led by Kurt DelBene.

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Story added 26. June 2012, content source with full text you can find at link above.