Each time I send/receive, Outlook downloads ALL incoming emails

[mjhp]

Each time I hit receive messages, Outlook downloads ALL incoming emails into
my inbox, even when already received.
So I am getting the same messages multiplied each receive.

I have checked to leave messages on server for 31 days as a backup
precaution and this has worked just fine for the past 2 years.
I have tried repairing Outlook but this has not cured the problem.

Anyone able to help please?

 

[BillR - MVP]

Download them all once using another profile or another email application so
that they are all deleted from the server. After that it should be ok.
The issue can sometimes be caused by antivirus integration.

 

[mjhp]

Many thanks for that, yes downloaded them all to OE and no further
duplicates, many thanks.

 

[Brian Tillman]

Each time I hit receive messages, Outlook downloads ALL incoming
emails into my inbox, even when already received.
So I am getting the same messages multiplied each receive.

I have checked to leave messages on server for 31 days as a backup
precaution and this has worked just fine for the past 2 years.
I have tried repairing Outlook but this has not cured the problem.

What version of Outlook?