I'm having a weird problem on a 0.8.6 OX ... one account (as far as is 
known it the moment) refuses to mark read mails as having been read ... 
even selecting the "Mark as: read" option only sets the flag 
temporarily, when returning to a folder, all messages are once again 
tagged new ...
I've checked the Cyrus folder of the user for wrong chmod setting, tried 
the rebuild in cyradmin, still all messages continue to remain new ...

In the webmail logg, I get this:

Mrz 06 14:43:08 ox.hef-rof.de openexchange: ERROR: MESSAGE LIST: 
uid=koch_a: Unable to fetch message list: javax.mail.MessagingException: 
* BYE JavaMail Exception: java.io.IOException;

None the less, the most current email are still listed correctly and can 
be read normally ... !? Also, User isn't over his quota, either ...

Any idea what might be going wrong here? I checked other loggfiles and 
couldn't find any further hints to the cause ... !?

tnx, -garry