Outlook 97 issue

Here is an issue I am having with a couple machines running Outlook 97 and 98. The setup is "internet only" and the users get their email from their ISP's pop server. Every so often they have emails that duplicate several times in their inbox. When this happens they cannot delete the duplicate emails and have to have the isp clear the origional out of the inbox from the server.

Steps I have take.
Archived their PST files and had them remove old emails.
added more pagefile - they have 512mb of RAM and 2gb pagefiles. So I doubt the resources could be the the cause of this issue.
Update NAV and scanned their machines.

Machines:
WinNT 4.0 SP6
IE 5.5 SP2
All updates have been install - HFNETCHK and all that
Office 97 with outlook 97 or 98
P3 733
512MB of RAM

Any ideas?

I had similar problems with a customer using Eudroa Pro. After much soul searching it ended up being dirty lines (excessive noise) connection to the ISP.

Hi,
We had this problem with email containing large attachments and us trying to download over a slow connection. In advance options there is a Server timeout setting. Default is 30 seconds but you can slide it up to 5 minutes.
This may not be your case but I am just inputting my personal experience with this problem and our solution to it.

Happy Holidays,
D