MailStore - MailStore Home - A 100% free single-private-user desktop solution
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...
Gmvault - Backup the emails in your Gmail account.
Softaken PST Mailbox Converter - Convert Outlook PST files data to MBOX, EML, & MBOX with Softaken PST Converter
Mail Backup X - Your one stop mail backup and archiving tool for Mac.
SoftSpire Zimbra Converter - Zimbra Converter is a complete Zimbra TGZ to PST conversion solution that supports to export complete user mailbox data from Zimbra desktop and webclient to PST file for Outlook and various cloud applications.