Keep receiving same Message in Outlook

The first thing to do is to check with your ISP if there is a bandwidth problem that is resulting in loss of connection between your Exchange server and your ISP.

It appears as thought there is an intermittent loss of connection between your Exchange server and your ISP which results in downloading the same messages all over again if the download fails half way in the first place.

The same thing happens if you are using POP3 to download from your ISP at home and the connection keeps breaking. When you establish connection again the whole messages starts downloading all over again.

There is at least one specific known circumstance in Exchange Server where this can happen because a message gets stuck in the queue. You might try checking the incoming mail queue in the IMC on your server and see if this is the case. If so, you should be able to manually remove the message from the queue. It could also be the outgoing message queue on the sender's server. The only thing that Microsoft suggests if this is the case is to install the latest service pack (SP4 for Exchange Server 5.5) to permanently fix the problem and prevent its possible recurrence. Hope this helps!

I am not very familiar with Exchange server (At my company we use MS Mail) but one of my users had the same problem, I checked her mail configuration and found out that under Tools>services>Advanced tab the check box to leave a copy on server was checked, I unchecked that and the duplicate mails stopped. I hope this helps.

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