Thread moved to Site Announcements.

Good idea nibbles! Watch the little coloured bar at the top of your PM list, if it reaches the end, you won't receive any more!

Also, for people like me who hate to delete anything, you can backup your messages before you clean up! Look down the bottom-right of your PM list, and choose one of the formats to save as. This will save the messages from all your folders as well, not just the one you have open!
LD