Yammer Connector Requirements
The connector was introduced with the CES 7.0.6339 January 2014 release.
Coveo license for the Yammer connector
Your Coveo license must include support for the Yammer connector to be able to use this connector (see About the Coveo License).
Supported Yammer versions
The connector supports Yammer Basic and Yammer Enterprise (CES 7.0.8225+ (March 2016)).