[Dovecot] Problem with huge IMAP Archive after Courier migration

[Timo Sirainen]

On Mon, 2012-01-02 at 17:17 +0100, Preacher wrote:
> So I forced to install the Debisn 7.0 packages with 2.0.15 and finally 
> got the server running, I also restarted the whole machine to empty caches.
> But the problem I got was that in the huge folder hierarchy the 
> downloaded headers in the individual folders disappeared, some folders 
> showed a few very old messages, some none. Also some subfolders disappeared.
> I checked this with Outlook and Thunderbird. The difference was, that 
> Thunderbird shows more messages (but not all) than Outlook in some 
> folders, but also none in some others. Outlook brought up a message in 
> some cases, that the connection timed out, although I set the timeout to 
> 60s.

Did you run the Courier migration script?
http://wiki2.dovecot.org/Migration/Courier

Also explicitly setting mail_location would be a good idea.