I have managed to accumulate a little over 500 pm's, mostly because I was working on a project that involved a bunch of 'Catters and needed to keep track of some information for a time until the project was completed. I need to delete them. Is there a way to do that other than one message at a time?

(Sad to say, if I can, I am going to lose some personal contact information for a few people that I meant to transfer elsewhere, but did not. However, there is no way I can go back now and cull that information, even if I have no choice but to delete messages one at a time.)