When Microsoft bought enterprise social network Yammer in June for US$ 1.2 billion, more than a few eyebrows were raised, especially since Microsoft already had enterprise social networking in SharePoint and was partnering with Yammer. Now, those same eyebrows may again be arching skyward following Yammer’s recent report of record growth last year and its plans to move toward closer integration with other Microsoft product lines.

The growth scorecard impressively announces Yammer’s status as a hot item in Microsoft’s portfolio. Sales for 2012 tripled year-over-year, fourth quarter sales quadrupled year-over-year, the number of paying customers increased 165% and Yammer’s number of registered users is now over 7 million.

SkyDrive Pro, Office Web Apps

The new customers in fourth quarter totaled 290 companies, which include a number of the largest retailers, food and beverage companies, telecommunications and pharmaceutical companies in the world.

Yammer co-founder and Microsoft Office Division corporate vice president David Sacks said in a statement that the unit’s “momentum is definitely accelerating following the Microsoft acquisition.” He added that Yammer’s mainstream adoption among organizations is being driven by “the freemium model and the validation that Microsoft brings to Enterprise Social Networking.”

Like Skype, which was also purchased by Microsoft for a hefty sum, Yammer is being integrated into other product lines. Yammer is currently implementing a SkyDrive Pro integration for file storage, and enhancing the ability to preview and edit Office Web Apps files within Yammer. SkyDrive Pro is the brand for the cloud storage used by Office 365, SharePoint Online and Sharepoint 2013.

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From the Yammer Website.

Sharepoint, Dynamics CRM

Both moves are intended to expand on Yammer’s ability to become a collaboration space for creating, working on and sharing content, and both are expected to be available sometime this summer.

Last fall, Microsoft also highlighted the ways in which it would be integrating Yammer with its collaboration and document management offering, SharePoint, and Yammer with Microsoft Dynamics CRM. The company has also been saying it will integrate Yammer with Skype, which could include some kind of marriage with Skype’s new product partner, Lync.