Use eSoftTools Outlook PST Recovery Software if you don't know how to import an Outlook PST file into Zimbra Desktop. You can get a live preview of each Outlook item as the software updates it, and it can recover all the data from PST files, including calendars, contacts, emails, tasks, notes, attachments, and other items. File types supported by this program include MBOX, EML, EMLX, MSG, and HTML vCards. The free demo version is available to all users. In the trial edition, you can recover up to 25 emails from each folder.