[Dovecot] Missing folders after converting from Courier imap to dovecot

[M. Bobkiewicz]

Hi,
I?ve searched around for my problem but couldn?t find a solution. My 
setup: Centos 5.1 with postfix 2.5.1 (from source) and dovecot 1.0.10 
(from source). I?m coming from an old Trustix 2.2 box with postfix 2.2.x 
and Courier imap with Maildir format mailboxes. For testing I?ve copied 
over some of the mailboxes from the old machine. After logging in to the 
new machine with Thunderbird only the incoming and trash folders appear 
in the Thunderbird sidebar all the rest are not showing up. When you 
send an email the sent folder appears with all mails this account has 
sent from the old machine, same with drafts etc. Access a folder 
directly and it will appear with all it?s content. This is some kind of 
nasty if you have to do this for several hundred folders.
I?ve tried to fix the problem by changing the namespace private 
parameter "prefix" to ".". Also tried to rename courierimapuiddb to 
dovecot-uidlist. Both tricks don?t work. Unfortunately I can?t find the 
mentioned courier-dovecot-migrate.pl, maybe this would help...
Any help and suggestion would be welcome.

Best regards,

Mike