I remember posting this, but I think it was on The Other Place; I was having messages copied and/or moved into my deleted folder for some reason.

Well, that reason *appears* to be that Outlook can't handle "Junk Senders" lists beyond some (unknown as yet) limit. Removing some things from the junk senders list made things all sweet and peachy (well, as peachy as it gets under Outlook that is.)