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>many large enterprises already had Office 365 licenses

Hit the nail on the head.

They are both garbage. Neither of them gets webrtc right in 2021, while Discord has had it working for years now. It is a rare thing, that I cannot hear someone on Discord and I can use it with any browser, while Teams and Slack still give me the middle finger for trying to do a call when using Firefox.

So whatever makes people use Teams, it's not Teams working well, that much is for sure.

The voice call part of teams works better in my experience and has a higher user limit.

Teams voice/video is better than Slack, worse than Zoom. In basically every other respect it's inferior to either Discord, Slack, or Zoom. The fact that I can't move the video thumbnails from their default location at the bottom of a call boggles my mind every day.

But Office is the standard, so bundling it Microsoft won the enterprise by default.