RESOLUTION
The error condition in most cases refers to a single message. There are three methods to clear the message.
Method 1
Use another mail client to download the message.
Method 2
Use the telnet terminal client to delete the message from the POP server. For more information about using telnet, please see the following article in the Microsoft Knowledge Base:
Q187782 OL98: How to Use Telnet to Test an Internet Mail Connection
Method 3
If the option to keep messages on the server is selected, temporarily change this option to clear the message. To change this option, follow these steps:
On the Tools menu, click Accounts.
Click the Advanced tab. Under Delivery, click "Leave a copy of messages on the server."
Click OK and then Close.
Once the server has cleared the problem message, re-select this option.