Microsoft acquired Yammer, a best-in-class Enterprise Social Network (ESN), in June 2012 to be included in their broader port ... folio. Yammer is available with Office 365, and together they form the core of Microsoft’s vision for Enterprise Social: to enable companies to work like a network. By connecting individuals to a dynamic network of people and information, we help companies listen, adapt, and grow in new ways, enabling them to better understand their customers, respond faster together, and deliver innovative products and personalized experiences. For more information about the Yammer acquisition visit: https://news.microsoft.com/2012/06/25/microsoft-to-acquire-yammer/#q9vMSIMq8d4quauT.97 read more