I have POP3 users reporting occasional duplicate emails. I have seen a couple hit my exchange inbox with Outlook 2007 from our Exchange 2007 server. Are there common causes to this kind of behavior?

Hi, It may be incomplete pop3 collection causing it. If you pop to your mail server and start collecting mail, your mail server will not delete any of your mail until your client has successfully collected it all, this is by design and part of the pop3 standard so it applies to all POP3 server types. As a result if your POP collect fails part way through with only some of the available mail collected you will get duplicates of the messages from the incomplete POP sessionwhen you next connect and sucessfully download the lot. Cheers,