If you are looking for smooth and smart migration from TGZ to Outlook and multiple other platforms, here is the option for you in the form of Zimbra Conversion app. It is a well-tested app to perform large-scale Zimbra emails conversion. This tool supports flawless conversion of email metadata. It is easy to operate and no technical skill is required while operating it. This tool is compatible with all window versions and performs deep file filtration task. Free demo facility is available to the users to know the key functions of the tool.
You can easily download it from the link given below: http://www.osttopstapp.com/zimbra-converter.html