Should we introduce Yammer first when starting Office 365 adoption?

Thanks Daniel, I think that that is one of the important questions. And I would like to add 'with the least amount of resources.' Because some values will take a lot of time / costs to implement while others are easily implemented. In my post above I argue that Yammer, for me, has been a relatively smooth implementation and might enhance other O365 implementations. However, I agree that this does depend on the goals of the organization and perceived added value of users.