Software & Apps MS Office How to Prevent Duplicate Messages in Outlook Express Do This When You Constantly Get Duplicate Messages in OE By Heinz Tschabitscher Writer A former freelance contributor who has reviewed hundreds of email programs and services since 1997. our editorial process Heinz Tschabitscher Updated October 17, 2019 Photoplotnikov / Getty Images MS Office Outlook Word Excel Powerpoint Tweet Share Email Maybe it's better than not getting emails at all, but receiving two or three copies of all emails is not much better. If you find yourself in this boat, filled with new instances of the same emails over and over again whenever you check for what are supposed to be "new" messages in Outlook Express, here are some things to try. What to Do When You Receive Duplicate Messages If you are accessing a POP account (this is most likely, and is the case if your email account is neither an Outlook.com nor an IMAP account) and have set it to keep mail on the server, at least for some time, the reason for the malaise may be a hiccup in the file that keeps track of the messages already downloaded. To fix the same messages coming from a POP account again and again: Open your Outlook Express store folder in Windows Explorer.Click on the file named Pop3uidl.dbx with the right mouse button.Select Delete from the menu. Since Outlook Express has just lost even the rest memory of which mail it has already seen, expect all mail still on the server to be retrieved the next time you click Send/Recv. After that, mail retrieve should return to normal, however. All duplicates already received can be eliminated fast with a duplicate removal tool like the one from MAPI lab. How to Fix Duplicate Emails in a Default Outlook.com or IMAP Account If your default email account is either an IMAP account or an Outlook.com account accessed directly, you may see two copies of every message in your inbox. This happens when you have Outlook Express set to retrieve new mail automatically upon startup and open the default inbox automatically when you start, too. Both commands download new mail, and if they do it in parallel, you'll see two copies of each message. To fix duplicate emails in a default Outlook.com or IMAP account: If the Outlook.com or IMAP account is your only account:Select Tools > Options from the menu.Make sure Send and receive messages at startup is not checked.Click OK.If you have more than one account:Select Outlook Express from the Folders tree.Make sure When Outlook Express starts, go directly to my Inbox is not checked.