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.
The engineering team is continuing to work on adding support for multiple accounts on desktop clients. We will first launch support for 1 work/school account and 1 personal account so users can enjoy Teams for work and personal side-by-side. Windows and MacOS. Support for multiple work accounts is still being worked on and will come at a later date.
You can track status via the roadmap here: https://www.microsoft.com/microsoft-365/roadmap?searchterms=68845.
An error occurred while saving the commentChris H commented
NEED ASAP this ability. In your chat groups it acts like it's so easy - click add contact to a chat group > type in the email of external person > click search externall, but then the box just disappears and nothing happens.
Teams is great - but still does not have feature parity with Skype for Business.