Use the comprehensive software vMail
ZimbraConverter to export Zimbra mailbox TGZ folders to PST, PDF, MSG, EML, EMLx,MBOX, NSF, Office 365, and other formats. All users, especially those who are
not professionals, may run the program and switch from Zimbra to another server
thanks to the user-friendly working environment it enables. Installation of the
Zimbra email application is not necessary in order to convert TGZ files using Zimbra
Converter. The program can batch export emails, contacts, calendars, and
briefcase from Zimbra into the desired saving format. By downloading the
software's free demo, which enables you to convert the first 30 files of each
item to the specified file format, you can test the Software's functionality.
Know more info- https://www.vsoftware.org/store/zimbra-to-mbox-converter/