This program will maintain all the file formatting as it is & gives you best result. & After completing the Outlook to Zimbra (TGZ) Migration, import the converted TGZ file to Zimbra Desktop. PST to Zimbra Desktop Converter tool you can easily Import Outlook PST to Zimbra Desktop. Outlook to Zimbra Webmail is a multi-purpose utility which helps user to convert Outlook Mails, Contacts, and events to Zimbra Webmail.