Gerard Bok writes:

Looking for some guidance. Or aspirin :-)

Situation: 10 mailboxes on a Courier IMAP server.
Multiple users on multiple locations, all sharing all mailboxes.

The aim is to use Outlook 2003.
Couldn't get that operational at all, so for the time being, we
settled for Outlook Express instead.

Synchronize accounts produces loads of 0x800CCC0F errors.
More specific: at quiet times, I am able to sync each mailbox
individually without any error.
Once I try to sync all accounts at once, loads of errors are
reported, on random mailboxes and even when I just finished an
individual sync.

By mailboxes I presume you are referring to IMAP folders. I doubt that you
are logging in to ten different IMAP accounts.

The default Courier-IMAP server configuration permits a maximum of five
simultaneous connections from the same IP address.

It appears that your mail client opens a separate connection for each IMAP
folder. The server refuses to accept any more connections, after the first
five, and then your mail client vomits all over itself.

Either increase the maximum number of allowed simultaneous connections, in
the server's configuration file, or switch to a different mail client that
implements IMAP properly.



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