[Dovecot] Converting from Cyrus -> Dovecot sdbox

Hello

we like to convert a IMAP server with Cyrus 2.2 to Dovecot 2.0.19 and
sdbox mail format. From what i have read until now this is a two stage
process with converting first from Cyrus to (Dovecot) maildir with for
example cyrus2dovecot and than with dsync from maildir to sdbox. Is
this correct or are there other possibilities to go in one step from
Cyrus format to sdbox?

Regards

Andreas