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If you don't know how to import an Outlook PST file into Zimbra Desktop, use eSoftTools Outlook PST Recovery Software. Using this tool users can easily view and migrate Outlook PST files calendars, contacts, emails, tasks, notes, attachments, and other mailbox items to different applications and file formats. It can import/convert Outlook PST files to Zimbra TGZ, MBOX, EML, EMLX, MSG, HTML, vCard, and cloud-based Office 365, YahooMail, and Gmail to Zimbra. All users can download the free trial version, of this tool to recover and export up to 25 emails from each folder of PST to TGZ and many other file formats.

For more info:- Import Outlook PST File to Zimbra Desktop