There are numerous ways to open Outlook PST files in Thunderbird but the most effective way to utilizing ZOOK PST to MBOX Converter. It allows users to convert PST files to MBOX format and offers to access or open PST files in Thunderbird . This tool easily convert PST files of all available Outlook like Outlook 2021, 2019, 2016, 2013, etc. It is completely professional and hassle-free to get PST to MBOX migration . Using this tool, you can also import PST to Mac Mail  for easily manage your Outlook emails in Apple Mail. 

Do you want to Import Outlook to Thunderbird then I suggest you download PST to Thunderbird conversion software. This tool has many functions such as it can show the sample of the PST file before conversion. It has a free trial edition that can help you to change a few items from each folder. This application can support all versions of MS Outlook, even it can support all versions of Windows. It can turn a faulty Outlook PST file into Thunderbird. it has 24x7 expert support users can get help by mail or live chat. This tool needed Outlook to run. Refer: https://www.sametools.com/convert/pst/