In contrast to other email clients, Mozilla Thunderbird client is an open source web-based email client that is used by numerous professionals and individuals to exchange or send emails in order to transfer important information. The Mozilla Thunderbird program can support IMAP, POP & LDAP address, and is able to function effortlessly across Windows, Linux and Mac OS. As a professional, there can be plenty of instances when we require to backup Mozilla Thunderbird Emails to an External Hard Drive, Computer or any other email client to ensure that our important email information secure. If you’re one of them and seeking a solution to backup Thunderbird Emails to External Hard drive, then continue reading.