I would like to suggest commercial solution like Zimbra to Exchange Server Converter. This tool import Zimbra TGZ items such as emails, contacts, journals, notes, and etc. This application import Zimbra to Exchange Server and multiple file-formats including PST, EML, MSG, EMLX, vCard, vCal, an etc.
Read more: https://www.kdetools.com/blog/how-to-migrate-zimbra-to-exchange-server.html
