Microsoft is making some changes in the integration of Yammer with SharePoint; as part of these changes, the Yammer App for SharePoint (2013 and Online) and the Yammer webpart for SharePoint 2010 will be discontinued on March 15th, 2016.
At this date, these applications will stop working completely. The Yammer Embed will be the only way to get Yammer integrated with SharePoint.
March 12th, 2015
- Public Announcement on Office 365 Network
- Additional channels for specific customers (Message Center, Direct Email)
September 15th, 2015
- Discontinuation of the Yammer App for SharePoint 2013 and SPO
March 15th, 2016
- Discontinuation of the Yammer Web Part for SharePoint 2010
Also, it is important to note that only SharePoint 2013 and the incoming SharePoint 2016 versions will support this embed feature.
You can use this step by step guide to implement Yammer Embed http://go.microsoft.com/fwlink/?LinkID=524800