imap: IOERROR: opening index mydomain.be!someuser: System I/O error

[Geert Janssens]

Found this error message in the system journal for my kolab 3.4 
installation on centos:

imap: IOERROR: opening index mydomain.be!someuser: System I/O error

I have checked the imap folder for this user, but I don't see anything 
obviously wrong. Each directory in there has its index file and they are all 
owned by the cyrus system user.

The system has 10 users and only this one gives the error message.

Where does this come from ?

Thanks,

Geert
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