<p>Yammer, the corporate social networking and content collaboration company that Microsoft acquired for $1.2 billion last summer, has seen "tremendous" momentum, according to Microsoft.</p><p>Microsoft said in an official blog post today that Yammer sales grew 259 percent year-over-year in Microsoft's third quarter, which ended last month, and that Yammer gained 312 new corporations as customers.</p><p>Microsoft did not disclose the actual revenue dollar amount. With the 312 new customers, Yammer now counts more than 200,000 corporations as customers.</p><p>Overall, Yammer has 7 million individual registered users, up from 5 million at the time of its acquisition.</p><p><a href="http://blogs.seattletimes.com/microsoftpri0/2013/05/09/microsoft-says-yammer-momentum-is-tremendous/">Keep reading...</a></p>