[Dovecot] Info regarding conversion of mbox to maildir

When I finally decide to convert to maildir, will I have to set up namespaces during the conversion, or will dovecot figure out where everything is by itself?

Should I set up deliver to go to maildir/ globally, or per user?

I have considered using the convert plugin, if there are not a lot of negatives.

-- MailScanner is like deodorant... You hope everybody uses it, and you notice quickly if they don't!!!!