Try professional software to KDETools Zimbra Converter securely convert TGZ to PST and different types of file formats such as EML, EMLX, HTML, PDF, and so on. The tool retains the email metadata during the conversion process. The software checks the preview of all emails with attachment after the scanning process.
A number of about methods which use for migrating TGZ to PST such as TGZ Converter Tool. However, you can choose any process to export your Zimbra data into Outlook PST. Though, I would suggest you go with TGZ to PST Conversion which provides a determination to shift TGZ to PST, EML, EMLX, MBOX and MSG formats.
Free to try: https://www.sametools.com/convert/tgz/