Just an idea i may have kinda mentioned before, but wasnt sure.

In our PM inbox it can be quite untidy to have many messages. So was thinking it would be a bit neater and maybe more user friendly if we had a conversation type set up.

Much like what we have on facebook or how you have SMS nowdays. It has one conversation with the user you PM or who PMs you, and all the messages fit in there?

Not sure how it would work, just a thought.