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Re:Abusing Teams client protocol to bypass Teams security po... by MaxBarraclough on Tuesday October 27, 2020 @01:13PM (#24909472)
I haven't tried it, but Element is a Free and Open Source alternative.

https://en.wikipedia.org/wiki/Element_(software)

Re:Abusing Teams client protocol to bypass Teams security po... by Krasnol on Tuesday October 27, 2020 @01:16PM (#24909506)
I failed installing the server a few weeks ago.

Got tangled up somewhere and didn't know where I was the next day. Maybe I'll try it again if Mattermost doesn't do it.