[pierlu]

Basically M$ is pushing hard to switch off Skype For Business (SFB) in favor of Teams, especially when still on-premise. The new features are being developed only for Microsoft Teams and the user base is a click away from a decent Slackish app. Another killer feature of Teams (inherited from Lync and SFB) is the trunking possibility with a legacy SIP PBX (so called Microsoft Team Direct Routing, or some form of similar creative name from Redmond market intelligence). So, I think that the future of Slack is probably the same as the future of Spotify, both like the article says incidentally direct-listed at the NYSE (and not via a formal IPO). Both will have a trusted user base, a better interface, but motivated tech giants competing into the same market.