If you wants to export emails from Mozilla Thunderbird to Microsoft Outlook then you an take help of most reliable and effective ZOOK Thunderbird to Outlook Converter software. It is dedicated tool to recover deleted or inaccess mailbox data of Thunderbird and import/export them to PST file format so that users can access or open them in all versions of Outlook including 2021, 2016, 2013, etc. There is no restriction of file size, You can import big size Thunderbird files to PST Outlook.