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the lync/skype vs MS Teams ratio captures something because it is likely that if you have MS-Teams, you have lync-skype, too & the skype folk are actively choosing to not use MS-Teams.

Slack is good ux, but has security problems https://www.nytimes.com/2019/07/01/opinion/slack-chat-hackers-encryption.html#click=https://www.nytimes.com/2019/07/01/opinion/slack-chat-hackers-encryption.html