[Dovecot] Migrate 0.99 MBox into 1.0rc15-2

Hello,

I have old MBOX-trees from a dovecot-0.99-installation. I would like to integrate them into dovecot 1.0.0rc15 with Maildir.

Sadly the old dovecot is no lonfger running, otherwise imapsync could be used.

Does anybody can give some hints how to start?

TIA

Stephan