MailStore - MailStore Home - A 100% free single-private-user desktop solution
imapsync - Console-based utility for migrating IMAP mailboxes.
MigrationWiz - MigrationWiz provides on-demand mailbox migration services through a fully automated cloud-based...
MozBackup - Backup tool for Firefox and Thunderbird
Gmvault - Backup the emails in your Gmail account.
IMAP Upload - IMAP Upload is a tool for uploading a local mbox file to IMAP4 server.