If you're looking for a useful tool to move Zimbra file to Outlook PST, KDETools Zimbra to Outlook PST Converter is a good choice.

• Move different file format PST, MBOX, MSG, EML, EMLX, PDF, HTML, and so on.
• This app also move calendar and contacts from Zimbra to an Office 365 account.
• Without causing any data loss, this application move dishonored files securely.

More details: http://www.zimbra-converter.com/