Outlook and Outlook Express cannot fetch mail - session ends with timeout
Outlook and Outlook Express has a bug that may cause the application to "hang" when collecting mail via POP3 - after a while the application reports a timeout and subsequent attempts to fetch mail all ends in the same way: Every time the process starts fetching this specific mail it hangs for a while and stops with a timeout. An alternative symptom is that one mail is fetched over and over again while other mails are left on the server.If the user logs into the webmail and deletes the oldes mail in the list (usually a SPAM-mail) the problem disappears and mails can be retrieved again - although it sometimes ends with another mail blocking the process again.
The error is caused by a bug in Outlook and Outlook Express that prevents it from handling a mil with an empty or damaged Message-ID which is a part of the information that is included in the mail and used internally by the application to process the mail. If another mail application is used the mail is downloaded and the problem disappears.
The website below has a description of the problem as well as a description of a filter that will delete the mail before it becomes a problem to the mail application: