Can someone explain to me why any company should outsource something as critical as internal communication to a company that is 5 years old? The video messaging left aside, is it really that better than time-tested solutions like email or just running an IRC server?
IRC is pretty much useless since you don't have history. Comparing Slack and IRC are like comparing TCP and HTML5. Why IRC is pretty bad in enterprise: - no audio / video - no history - no SSO / AD integration - no rich features like links, pictures, upload docs ect ... - easy bot integration with APIs, I can have Datadog pushing things to Slack ( alerts, graph... ) - no archiving channels on the go, Slack is very us…
The features you're listing is server/client dependent.