I am looking for the best and most reliable way to transfer Outlook emails from PST to TGZ format. I have multiple PST files that I need to access in Zimbra, and since Zimbra supports TGZ, I need a safe method to convert them without losing any data. I have already tried some manual tricks, but they either take too long or do not work properly with large PST files. So, I want to know what the most effective method is to convert PST to TGZ? Is there any trusted tool that can perform PST to TGZ conversion without data loss?