If you don't know how to import an Outlook PST file into Zimbra Desktop, use eSoftTools Outlook PST Recovery Software. You can see a live preview of each Outlook item as it is updated by the software, and it can recover all data from PST files, including calendars, contacts, emails, tasks, notes, attachments, and other objects. MBOX, EML, EMLX, MSG, and HTML vCards are among the file types supported by this tool. All users have access to the free demo version. You can recover up to 25 emails from each folder in the trial edition.