mb2md - 3.20-9 main

mb2md (mbox to maildir) takes one or more Mbox format mailbox files
in a directory and convert them to Maildir format mailboxes.
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As the Mbox format has some drawbacks, D. J. Bernstein created the
Maildir format when he wrote Qmail. With the Mbox format all mail of
a specific folder is stored as one large text file. The Maildir
format stores each mail as a separate file. It is a faster and more
efficient way to store mail. It works particularly well over NFS,
which has a long history of locking-related woes.
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The Mbox format is used by many POP3/IMAP servers, most mail servers
(MTAs) and mail readers (MUAs). The Maildir format is used by Qmail,
Courier-MTA and can be also used as a alternative mail storage format
by Postfix and Exim or any MTA which can use procmail as
MDA. POP3/IMAP servers which support Maildirs are e.g. Courier IMAP
and Dovecot.
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mb2md does not only convert Mbox mailbox files into a Maildir but can
also convert the /var/spool/mail/$USER mailspool file. It is smart
enough to not transfer a dummy message such as the UW IMAPD puts at
the start of Mbox mailboxes - and you could add your own search terms
into the script to make it ignore other forms of dummy first message.