How many times can you read a PM? For goodness sake, copy the thing to a txt file and save it on your own computer if you want to keep it for prosperity's sake!!! All PM's should be dropped when a certain amount is given (say 100 PM's) and new ones come in. The oldest is deleted and all new ones take their place. It's a simple concept, "Move it, OR lose it"
That's my story and I'm sticking to it!!!