System I/O errors - Help needed.

[Anders Norrbring]

I've gotten a couple of reports from clients using Outlook Express that 
they get the following:

Your 'Inbox' folder was not polled for its unread count. Could not get 
the unread counts for 'Inbox' on 'Fredrik' Account: 'Fredrik', Server: 
'mail.the-server.net', Protocol: IMAP, Server Response: 'System I/O 
error', Port: 143, Secure(SSL): No, Error Number: 0x800CCCD2


I don't see any errors at all on my own 12 accounts on the same IMAP 
server, which is Cyrus v2.3.8.
I tried to run a reconstruct on the problematic mailboxes, still the 
errors continues. Of course their "read" status aren't updated.

Please advice.
Anders Norrbring