Just to be fair, internally we&#x27;re currently using Slack. We&#x27;ll be switching to Rocket Chat next week (right before we all fly to Austin to meet everyone face-to-face, so God help us there if stuff breaks). I&#x27;m relatively new, so I don&#x27;t know what happened with Mattermost. I also haven&#x27;t been following what we&#x27;re intending to ship with in future versions, it could be both or just one, but don&#x27;t quote me on that.