One of the most remarkable features of the DRS Zimbra Converter Tool is its ability to convert TGZ files. Users can convert the Zimbra inbox into many formats, including PDF, PST, HTML, DOC, and more. Additionally, adding and converting several TGZ files at once is a simple process for users. The application allows you to migrate emails from Zimbra with or without attachments. All of the tool"s built-in capabilities are also available to you. Options for Zimbra Mailbox conversion include PST, MBOX, EML, PDF, DOC, CSV, and other formats.
Source: https://www.data-recovery-solutions.com/zimbra-backup.php