Outlook 2007...set up as POP, leave a copy on the server 14 days...I am getting duplicate and sometimes triplicate emails. Only 1 account setup. Any help will be appreciated....thanks
Denise SAsked:
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Tom CieslikIT EngineerCommented:
It looks like your outlook is loosing connection on the end of transmission and is unable to send information about downloaded emails to server.
Try to extend time for server connection on connection properties / more settings/ Advanced Tab
Try to Server Timeouts for 2-3 minutes.

If this will not help maybe it would be better for you setup IMAP connection

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Mal OsborneAlpha GeekCommented:
That is pretty normal for a POP3 connection.

The POP3 client will usually issue a DELE command after retrieving each message, meaning delete. The POP3 specification, however, dictates that the deletion does not actually take place until the session has completed, and the client has issued a QUIT command.  

Thus if anything interrupts mail retrieval, the POP3 client will start again from the beginning. If you have retrieved 99 out of 100 messages and the power goes out, when you try to retrieve email next time, it will begin with message #1 again.  This is by design, if the server were to operate differently, it would no longer be a POP3 server.

The POP3 protocol is described in the link below, it includes the following:

If a session terminates for some reason other than a client-issued
   QUIT command, the POP3 session does NOT enter the UPDATE state and
   MUST not remove any messages from the maildrop

Jessica KCommented:
Hi Denise,

You can do as suggested by the expert above. And I agree that it happens in case of POP3 account, so as I have tried and searched, it is better to have a relevant third-party tool to delete duplicate Outlook emails. One such software is Outlook Duplicates Remover which helps a user to remove all the duplicate emails in a hassle free way. There is an informative regarding the same, you can check this also:
Seth SimmonsSr. Systems AdministratorCommented:
No comment has been added to this question in more than 21 days, so it is now classified as abandoned.

I have recommended this question be closed as follows:

-- Tom Cieslik (https:#a42396197)
-- Mal Osborne (https:#a42396358)
-- Jessica K (https:#a42396416)

If you feel this question should be closed differently, post an objection and the moderators will review all objections and close it as they feel fit. If no one objects, this question will be closed automatically the way described above.

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