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Hi dtba,
Do you have an exchange or normal pop3 email? If you do have pop3, try logging into your webmail and delete any delivery report mails that might be in your inbox.
I don't know whether this might be your issue, but I have seen this with a few of my clients where one message is somehow sent twice and in the webmail it shows the two messages but for some unknown reason it causes a loop and outlook is unable to delete the mail from the server, so each time they send&receive the same message is downloaded again and again.
I hope this might help.