This item remains on the backlog.
Thank you for your votes and comments on this feature. The team is in the process of finalizing designs for deleting private chat threads.
Please follow the updates to this feature request in our Public forum: https://microsoftteams.uservoice.com/forums/555103-public/suggestions/33535006-delete-private-chat-threads
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is this just a government side issue or is it Teams commercial as well. We are having issues now with our VDI downloading all the past conversations and taking up cache.