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Q: My problem is that all of my incoming email messages are in duplicate. I’m using Outlook Express 6 on a WinXP computer, which has a 1.6GHz processor, 512MB of RAM, and a 40GB hard drive. I have looked at various options in Outlook Express, but I can’t figure out how to avoid receiving messages in duplicate. How can I fix this?
A: Email has become such an integral part of our computer usage that problems like this can quickly exasperate the most patient users among us. Troubleshooting this problem will require a bit of patience on your part, as well as the assistance of your ISP. You didn’t specify what type of email service you’re using, but we’ll assume that it’s POP (Post Office Protocol), the most common variety.
The first step is checking with your ISP to see if you are receiving duplicate messages via the email server. If you find out that your mailbox on the email server has 10 messages, for example, but you receive 20 messages when you download your email, your ISP is probably off the hook for this problem. However, if it looks like your ISP is receiving the duplicates before you even retrieve your email with Outlook Express, you’ll have to depend on one of its employees to troubleshoot the problem.
If the problem doesn’t lie with your ISP, then it’s probably due to a corrupted file that Outlook Express uses. When Outlook Express downloads your email, it also keeps track of which messages it has received and tells the email server to delete the original message. This file that Outlook Express uses to keep track of these details is Pop3uidl.dbx.
Sometimes Pop3uidl.dbx becomes corrupted or damaged and requires that you delete the original file. To do so close Outlook Express and then search for Pop3uidl.dbx by clicking Start, Search, and All Files And Folders. After you type Pop3uidl.dbx in the All Or Part Of The File Name field, be sure to click the button next to More Advanced Options, so you can select the Search Hidden Files And Folders checkbox. When you finish, click the Search button.
In the search results listed in the right pane, right-click Pop3uidl.dbx and click Delete. Then, restart Outlook Express, so it creates a noncorrupt Pop3uidl.dbx version that should prevent duplicate email messages from being delivered to your inbox. Depending on how much email you receive, you may have to periodically recreate this file using the steps we’ve outlined.
and also
http://www.webdimension.co.uk/email-setup.html
and a number of other links. Have you contacted mindspring tech support?