MailsDaddy Zimbra Converter tool to move Zimbra mailbox to PST, Office 365, EML, and various other file formats. It manages all folder structures, headers, inline images, contacts, calendars, tasks, etc. in a new PST file. The free demo version of the software converts up to 20 emails from each folder.
Read more: https://www.mailsdaddy.com/zimbra-converter/