I’m not a huge fan of Yammer. But that’s just me — well, me and most of Exchange-loving friends. We grew up in an age of email, so many of us prefer that “serious” communication go into an email — an unignorable, fully archivable, and trackable email.
But many people, especially the younger generation, like messaging-style communications popularized in the enterprise by Slack and HipChat. And like it or not, Yammer is free with Office 365 subscriptions, so some organizations are using it for communication and collaboration. That means IT admins need to consider the settings available to them, as well as what features are not included and thus may require a third-party assist.