Thank you for your votes and comments on this feature. The team is in the process of finalizing designs for deleting private chat threads. I will update as we have more progress to share.
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Please add the delete function to Teams, at least for private chats. Any chat between two or more people that is not participating in a Team chat.
I don't want, or need to know that someone a year ago said, "Hey you busy, can I call you?"