Needless to say no one should be sending 56MB files (though this one looks like spam) but boy it sure played havoc with one of our employees. Interestingly enough thunderbird was able to see the message and toss it in the trash just fine. Yippee for thunderbird! Mac mail through imap (instead of playing games with exchange directly) might have done the trick too I dunno. Being able to easily go in and find/delete the message in exchange would have been nice, but searching on the mailbox was painfully slow..... On a linux server running with maildir format it would have taken two seconds.