How can I transfer Thunderbird to Outlook on Mac OS? Use the latest Mac Thunderbird to Outlook transfer tool in easy manner, software is designed with DIY interface to help users and organizations to transfer Thunderbird files to Outlook on Mac OS / Mac OS X all along with complete Thunderbird emails, contacts and calendar items. Batch transfer Thunderbird to Outlook mail on Mac also can be executed by using the latest Mac Thunderbird to Outlook transfer tool with no data loss. Download the free Thunderbird Transfer for Mac tool version to test its working efficiency, supports 20+ files at a time.