[Dovecot] courier IMAP to dovecot migration: folders not showing up

[Jacob Yocom-Piatt]

i have been running postfix + courier-imap + cyrus sasl for several 
years and have some prior experience with dovecot + postfix and had no 
problems. now that i'm trying to convert an existing courier-imap 
configuration to dovecot and all the various parts work together (e.g. 
mail delivery and dovecot sasl), i cannot get the folder subscription 
issue sorted.

the machine is running netbsd 4.1 + postfix 2.5.1 + dovecot 1.0.13.

searching for a bit yields the following useful links

http://wiki.dovecot.org/Migration/Courier
http://wiki.dovecot.org/Migration
http://marc.info/?l=dovecot&m=120592911416484&w=2

i have downloaded and run the courier-dovecot-migrate.pl script and that 
does not do the trick, nor does following it up with the suggested 
changes in the private namespace.

an example of one of the maildirs i have at hand is

mail# ls 
-al                                                                                                                                                                                                                                                                       

total 1580
drwx------  71 vmail  users     2560 Jun 27 13:47 .
drwx------  24 vmail  users      512 May 28 14:10 ..
drwx------   6 vmail  users      512 Jun 27 12:10 .Drafts
drwx------   5 vmail  users      512 Jun 27 13:17 .INBOX.Trash
drwx------   6 vmail  users      512 Jun 27 12:45 .RT
drwx------   6 vmail  users      512 Jun 27 12:50 .Sent
drwx------   6 vmail  users      512 Jun 27 12:46 .Trash
drwx------   6 vmail  users      512 Jun 27 12:45 .Trash.bro
drwx------   6 vmail  users      512 Jun 27 12:45 .associates
....

and the subscriptions file, after courier-dovecot-migrate.pl runs is

Trash
Sent
Drafts
associates
....

based on the folder subscriptions, i have attempted to move the folders 
preceded by a '.' to the same name without a '.'. this does not fix the 
problem either.

any clues on how to fix this issue would be welcome.

cheers,
jake