[Dovecot] Migrate dbox 1.2 virtual mail to 2.0

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.