ReliefJet Essentials for Outlook - A large set of useful and easy-to-use tools for every Microsoft Outlook user: Import, export and convert using EML,MSG,TXT and PST formats; remove duplicate items, process attachments and extract addresses; get reports and statistics and even more...
imapsync - Console-based utility for migrating IMAP mailboxes.
Cloud Email Conversion - Looking for email migration service? Cloud Email Conversion easily turns the bunch of email files into the Outlook PST file preserving the folders structure
Gmvault - Backup the emails in your Gmail account.
Import Messages from EML Files - Free and easy way to import messages from EML format files to the specified Outlook folder.
Cryoserver - Cryoserver is an all-in-one email archiving solution that empowers you to preserve your email in a tamper-evident archive, making you transform your data into a useful archive for everyday use.