Yammer on the web is awesome. The iOS version(s), however, seem to have some limitations and issues. For iPad users there seems to be an issue that prevents at least some users (myself included) from viewing messages in private groups (doesnt seem to be an issue on the iPhone). Attachments are viewable (again at least on iPhone), but there doesnt appear to be a way to download the attachment or open it in another app, so aside from copy and paste, editing or saving is not an option. You would think Microsoft would at least allow office files to be saved to OneDrive or opened in their respective iOS apps, but that doesnt seem to be the case, and its a shame, because otherwise this is a rich and useful platform with a lot of promise. Hopefully Microsoft will address these issues in a future release, but for now it seems just shy of being ready for primetime on iOS.
Dvlrbbt about Viva Engage, v6.6.23