There are a lot of users who have MBOX file and they want to import MBOX to Thunderbird to access its data. They can easily do it via ImportExportTools. So, first of all they need to install this add-ons tool in Thunderbird and after that they can perform importing process.
Follow the below given steps to open MBOX file in Thunderbird
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Open Thunderbird and click on 3 horizontal line at the top right side to choose Add-Ons and Themes option.
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Type ImportExportTools in search bar and press Enter.
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Choose ImportExportTools and click on +Add to Thunderbird.
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After that, restart Thunderbird application.
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Now, navigate to Tools >> ImportExportTools >> Import mbox file.
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Select MBOX file that you want to import.
Done! Hence, you can manually import MBOX file into Thunderbird but if you are facing any issues with it then you can use Advik MBOX Converter tool on your system. With this software, you can easily open MBOX file in Thunderbird without any external help.