We have recently had an issue with outlook 2003 working with a new Courier IMAP Server.
Connections would be made to the server and emails would be downloaded, however it would then give the following error:
Task ‘Checking for new mail in subscribed folders on 123123.co.uk.’ reported error (0x8004DF0B) : ‘Outlook is unable to download folder (null) from the IMAP e-mail server for account 123123.co.uk. Error: The connection to the server is unavailable.
Google search turned up many things to try from turning off anti-virus email checkers to un-installing the Microsoft Exchange add-in for outlook, but none of these fixed the issue.
We finally tracked it down to the number of connections to the courier image
To Fix:
edit /etc/courier-imap/imapd
and increase your MAXDAEMONS and MAXPERIP settings
on ours we changed both to 100
MAXDAEMONS=100
MAXPERIP=100
If you are running your courier over SSL you will need to edit /etc/courier-imap/imapd-ssl file as well
Make sure that your server has enough resources, especially memory to cope with the settings that you give it, ours is a VPS with 6gb of RAM so it can easily cope. We will monitor and increase these settings if required.
We have not seen the error message since we made this change to the server so hopefully this will cure the problem permanently.
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