Yammer included with Office 365
Microsoft announces that users of the Office 365 Midsize Business and Office 365 Education plans can get licenses for the social networking service Yammer at no additional cost. Office 365 Enterprise plans already include the service, which allows for communication within organizations:
This simple licensing change significantly reduces the friction in cross-organization collaboration and will enable your users to work with customers, partners, and parents and students without having to worry about additional costs.