Currently the chat works like other instant messages/sms/emails etc. If you send a SMS or email by mistake you cannot delete it and take it back. Same behavior works with Podio messages, when you send a message you cannot take it back.
It sounds like you all mostly are looking for a function to hide your own chats, not colleagues. Currently it works so old chat messages will automatically be archived in your list and new chat messages will appear first. So it will "automatically" be archived and new messages will appear first.
Would you like to see a separate folder to locate those messages? Or would you prefer to delete them from your list completely (even if not deleted for colleagues)?
Also, would you expect a recover functionality similar to email?
No current plans here short-term, but we really appreciate your feedback and input on this.
Thanks for sharing :)
//Sara - Podio