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Re:Abusing Teams client protocol to bypass Teams security po... by gaogao on Tuesday October 27, 2020 @01:03PM (#24909381)
Mattermost is a fairly good open source alternative.
Re:Abusing Teams client protocol to bypass Teams security po... by Krasnol on Tuesday October 27, 2020 @01:12PM (#24909465)
Ah yes, I've heard about that one before.

I'll check that out. Thank you.