i realize i'm a traitor, but i think there are probably a few on this list
contemplating the same thing...
i plan to switch from uw-imap to dovecot on a couple of medium size systems and
so i have written a conversion tool that understands mbox, mbx, and mix formats
and converts to maildir format while trying to preserve uid info, keywords,
flags, subscriptions, etc. it seems to work for me now, but i think some
feedback might be useful. so if you have some files to convert and a desire to
help, please download:
http://www.spiretech.com/~joey/uw2dovecot.pl
and give it a whirl. it is very sparsely documented right now but isn't too
complex (yet). by default it copies your INBOX, mail dir, and .mailboxlist
info into Maildir. those filenames can be overridden. i'd suggest running
with -v to watch it. it requires that the output directory not exist before
starting, so it should be relatively safe. it doesn't lock any files being
read, so an active uw tree could cause it indigestion. it's designed to run
while inbound mail and pop/imap sessions are disabled. it uses a few perl
modules, but they should be standard with perl itself. it does do everthing in
memory, so the largest message you have will be in memory and will be
duplicated at least once as crlf pairs are replaced. also, this assumes you'll
change the uid format in dovecot.conf to %08Xu%08Xv so that it doesn't change
uids for the clients.
send feedback to me and cc the list if you feel it useful. once this is
stable, i'll get it added to the dovecot wiki.
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