I wonder how the "Microsoft is gaining on Slack" narrative would be changed if we had metrics on Lync/Skype for Business users that switched to Slack or Teams.
Basically I have enormous doubts about Microsoft's growth numbers in the space, since I can't fathom that anyone who wasn't already paying for MS products would choose to use teams, and I'm curious if they've made up the ground they lost to Slack in the first place.