E-Mail Migration

MH2Maildir

http://www.informatik-vollmer.de/software/mh2maildir.php

The great IMAP migration

http://briantroy.com/blog/2008/08/26/the-great-imap-migration/

Gmail to Google Apps Email Migration

http://www.thamtech.com/blog/2008/03/29/gmail-to-google-apps-email-migration/

How to Migrate Emails from Maildir to Gmail

http://scott.yang.id.au/2009/01/migrate-emails-maildir-gmail/

Migrating your old imap to gmail

http://colin.guthr.ie/2009/02/migrating-your-old-imap-to-google-mail/

Gmail migration with IMAP and the Java Mail API

http://blogger.ziesemer.com/2008/07/gmail-migration-with-imap-and-java-mail.html

Converting Mbox mailboxes to Maildir format:

http://batleth.sapienti-sat.org/projects/mb2md/

http://www.akadia.com/services/converting_mbox_mdir.html