You can also try Vartika Zimbra to PST Converter that enables you to convert Zimbra emails, mail folders, briefcase, calendars, recurring events & appointments, contacts, distribution lists etc. to PST file. Now you can easily access your Zimbra Desktop/ Web Client data in Outlook 2019, 2016, 2013, 2010, 2007 and 2003.

Know more info- https://www.vartikasoftware.com/fr/zimbra-to-outlook-migrator.html#