Anyone know of any free or very low-cost plugin for MS Outlook 2007 to automagically remove duplicate messages? I keep getting dupes from several vendors and our mail host swears that at least one of them is coming into their server that way, which means there's nothing I can do to keep from getting dupes.

On the other vendor, I've verified that the messages are true dupes by looking at the message-id kludge and verifying that they are identical.

Any help would be greatly appreciated!