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Cisco and Microsoft top the leaders quadrant in Gartner's latest UC Magic Quadrant for 2012.
Check it out at : http://www.gartner.com/technology/reprints.do?id=1-1BUINJX&ct=120828&st=sb
Check it out at : http://www.gartner.com/technology/reprints.do?id=1-1BUINJX&ct=120828&st=sb