Reply To: How to Open MBOX Archive File?

Open Mozilla Thunderbird and follow these steps:

1. Click on Tools >> Import/Export Tools >> Import MBOX file.
2. In Files MBOX Import window, select Import directly one or more MBOX files.
3. Click on OK to import MBOX to Thunderbird.
4. To move subdirectories along with MBOX file, select Import one or more MBOX files, with subdirectory option.
5. click on OK and then, browse all the MBOX files and click on Open to import converted MBOX files.