Cyrus2Dovecot is a full-featured command line tool for converting the email messages of one or more users from the Cyrus format to Dovecot Maildir++ folders. It allows you to perform a server transition which is fully transparent to both POP and IMAP users, as virtually all available metadata is preserved during the conversion. This includes message UIDs, INTERNALDATEs, IMAP folder subscriptions, the UIDVALIDITY and UIDNEXT values for each folder, as well as all IMAP flags (including the first 26 user-defined keywords).
