verwijderen duplicate mails in MAIL

I have been using several different program(Eudora, Thunderbird, Outlook) on the same account for the past years and decided to import all emails into Apple MAIL program. There are many duplicates (hundreds) and I do not wish to remove them one by one. Is there an option or trick to use Tiger OS 10.4.4 or the MAIL program to delete duplicates, they are annoying and take up to much space, thanks

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Any help?