Well... As I understand it, you can have up to a maximum total of 30 messages in your overall PM box. If you have, for example, my particular case... 21 messages in your PM inbox that you've received from other members, and 3 messages in your Sent Folder or "outbox", that means you have a total of 24 messages, an 80% of the PM box filled to capacity and only have room for another total 6 messages. Hope this helps Snowthmeiser.