By clicking MESSAGES in the small profile , you can access all the messages you have sent and received.

( Messages remain there until you delete them. )

The default display will show unread messages with the most recent at the top.

Each message displayed in that screen acts like a folder entry point to see the dialog history with that other person. You can remove messages that are no longer required or whole dialogue histories by ticking the boxes and clicking the DELETE button at the bottom of the screen.

If you delete a message by accident there is no process to recover that message.

There are no plans to change the PM system in any way.

It is designed only for short messages between site-members, it is not a full-featured email system and will not become one.