User recv'ing duplicate emails

A user in my company is seeing duplicate emails in their Outlook Inbox. I checked the Message-ID and they were the same, so these looks like the same message. Checked OWA, and they were in there as well. All emails are from internal senders anyway so whatever happens the problem is on our side!

Not user on where or what the problem could be? AV on the user's PC looks ok, can't see anything strange happening and we haven't made any changes to Exchange (2007) recently
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Joe_BuddenAsked:
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waleedaCommented:
Usually this is because his outlook rules, please try to delete all the rules he has on his mailbox, and check
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hasan1stCommented:
Also make sure the user did not add the account to outlook twice. ex. once as exchange and again as POP3.
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AmitIT ArchitectCommented:
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