[Dovecot] Migrate dbox 1.2 virtual mail to 2.0

[Nick Rosier]

Hi,

I'm trying to migrate from Dovecot 1.2.16 to 2.0.7. Initially the mails 
were stored in Maildir format but I changed them to dbox using "fast 
Maildir migration" and some mails are still in the old maildir format.
I'm trying to migrate these mails using dsync but dsync panics:

%  dsync -D -o mail_location=dbox:/var/spool/vmail/bunbun.be/nick mirror 
dbox:/var/spool/vmail2/bunbun.be/nick
......
dsync(vmail): Panic: file mail-storage.c: line 1351 
(mailbox_save_set_guid): assertion failed: (guid == NULL || *guid != '\0')
zsh: abort (core dumped)  dsync -D -o 
mail_location=dbox:/var/spool/vmail/bunbun.be/nick mirror

Any ideas?
N.