[Dovecot] convert plugin

[FiL @ Kpoxa]

Was about to try convert plugin (as opposed to mb2md.pl) and noticed, 
that it doesn't convert subfolders.

I have following structure:

~/
 | mail/
       | Archive
       | Help
       | Sent
       | Done/
              | Cardiology
              | Childrens
              | Orkin

when I use convert-tool -

#convert-tool username /home/username mbox:/home/username/mail/ 
maildir:/home/username/Maildir/
Error: Mailbox conversion: Couldn't create mailbox Done/Cardiology
Error: Internal failure


If I try "on the fly" conversion (by putting convert_mail = mbox:%h/mail 
& convert_skip_broken_mailboxes=yes in dovecot.conf) I get this in the log -
Mar  6 12:23:33 enders2 dovecot: imap-login: Login: user=<username>, 
method=PLAIN, rip=::ffff:127.0.0.1, lip=::ffff:127.0.0.1, secured
Mar  6 12:23:43 enders2 dovecot: IMAP(username): Mailbox conversion: 
Couldn't create mailbox Done/Cardiology

Both methods convert Archive and Logs mailboxes fine.

Can anybody confirm?

P.S.
Linux enders2.tchlab.org 2.6.18-1.2200.fc5smp #1 SMP Sat Oct 14 17:15:35 
EDT 2006 i686 i686 i386 GNU/Linux
dovecot-1.0.rc22 (I know this is not the latest version, but I didn't 
see any changes to convert tool/plugin).

FiL