[Dovecot] All mails unread after short while

[francwalter at gmx.net]

Am 03.03.2011 um 17:56 schrieb Charles Marcus:
> 
> Which is not much of a problem description, but obviously means you did
> something wrong... so, instead of finding/fixing the problem, you just
> reverted?

Yes, i reverted and put back the config-files of the old dovecot version. 
After this everything worked well again like i thought.
I will upgrade Dovecot in some weeks for sure because of Quota, but at the moment i am happy if just the little (?) Unread-problem is away ☺

But anyway, where can i find the place where the mails are set to read or unread?