When transferring mail between different systems, it's probably easiest
for a user to log on to two IMAP servers in a mail client and just drag messages
across. But we were looking for a way to export a user's folders to some
kind of portable format on removeable media without a lot of user
interaction.
I found some notes on Mozilla's file format which seems to be consistent
across Linux and Windows, and is basically a Unix mail file with an
external .msf index, which Thunderbird will recreate if missing. So one
can just copy files into the mail directory, or use the ImportExport
add-on, and get Unix mail folders off a CD into a Thunderbird local
folder.
https://nic-nac-project.org/~kaosmos/mboximport-en.html
http://en.wikipedia.org/wiki/Mbox
Having done that, it seems that all the message flags are missing, except
"Read", so I wrote a bit of Perl to set them. The resulting
X-Mozilla-Status headers should be harmless to other Unix mail readers.
I'm probably re-inventing the wheel, but if anyone's interested :
$ mailutil copy -kw foobar \#driver.unix/foobar.unix
$ unix2tbird.pl < foobar.unix > foobar.mozilla
http://andrew.triumf.ca/unix2tbird.pl
--
Andrew Daviel, TRIUMF, Canada
Tel. +1 (604) 222-7376 (Pacific Time)
Network Security Manager
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