Forum Discussion
Retention and access to Teams 1:1 chats without an Exchange Online mailbox
As we know, a 'compliance' copy of Teams chats is saved to either personal or (Microsoft 365) Group mailboxes. It is this copy that is subject to retention policies and can be found and exported via ...
Very good points, and a very diligent piece of testing! 
I think this is one of those situations where the responsibility and the risk is definitely with the customer. We can advise till we are blue in the face, but sometimes the advice will be disregarded.
I think retention in Teams will evolve and change, but for now, it is what it is, and works really well if you do things properly as you suggest.