Microsoft announced Monday that it will buy Yammer, a social network for businesses, for $1.2 billion in cash, "as it seeks to strengthen its enterprise software business and compete more directly with Salesforce.com." Yammer — which allows companies to create private social networks so that its employees can chat, share files, and collaborate — will continue to be led by its chief executive David Sacks. The social network has more than 5 million users, and is utilized by more than 85 percent of Fortune 500 companies.
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