I often receive duplicated emails in Outlook Express
Answer
If your POP3 mail account is configured to "leave a copy of messages on the server", it sometimes happens that Outlook Express downloads the same messages again and again.
This is caused by a damaged "Pop3uidl.dbx" file in your Identity's store folder. This file keeps track of which messages on the server have already been downloaded and should therefore be skipped on subsequent downloads.
To fix the problem, simply delete the "Pop3uidl.dbx" file (you could search for it if you don't know where it is stored). The next time you check for mail, all the messages on the server will be downloaded again, but a new "Pop3uidl.dbx" will be created that should work properly on subsequent mail checks.
