I recall, on a thread like this some time ago, that it was stated that a WM could, albeit with difficulty and time consumption, read PM's of a poster, if a reason presented itself to do so. It was stated that it was not, as stated above, just a 'push-button' task, but rather somewhat time consuming, though possible. I do think it was stated back before the VBulletin software, on the old Infopop.