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MailStore - MailStore Home - A 100% free single-private-user desktop solution
SysTools Gmail Backup - Backup Gmail Emails, Contacts, Calendar, and Google Drive Storage File by SysTools Gmail Backup Solution
MozBackup - Backup tool for Firefox and Thunderbird
ShDataRescue Hotmail backup Tool - Smart Hotmail Backup utility to save & download Hotmail mailbox emails to desktop. Hotmail email backup tool allows you to backup Hotmail items to PST, MBOX, Gmail, PDF, Yahoo, etc.
imapsync - Console-based utility for migrating IMAP mailboxes.
MigrateCloudData Yahoo Backup Tool - Yahoo Backup Tool allow users to backup and download Yahoo emails to hard drive into various file formats and popular email clients along with attachments.