Using gmail account to send receive emails. In Outlook in Inbox and All Mail, receive duplicate of mails. In Send and in All Mail duplicates are sent there. I'm guessing it is a setup problem in either Outlook or in my gmail account. Help!

Hi,

If you are using Gmail POP3, please try to setup Gmail IMAP to check the result.

Check if there are any rules setting in Outlook, if yes, disable it to check the result.

Start Outlook with the switch command-line "Outlook.exe /safe" to check if the behavior of receiving dulpcated message still happen in a non-add-ins environment.

And this is Exchange Forum, I suggest you to create a new thread to outlook forum for further assistance.

Best Regards.