"David.M.Clark" <david@davrom.com> writes:

Would be great to run both mbox and MailDir at the same time so we can do the slow user-by-user process rather than having them all down at some point completely ... - might look at running Dovecot on a different

I believe you can do this by using a userdb that can accommodate extra fields. In particular, supplying a mail field will overwrite the global mail_location. You can iterate through your users, convert them one at a time, then update the mail field as you go. At the end, update mail_location to your new default and remove the extra fields.

https://wiki.dovecot.org/UserDatabase/ExtraFields

Joseph Tam <jtam.home@gmail.com>