I recently switched from Microsoft Outlook to Thunderbird, and now I need to convert PST files into MBOX format. These PST files contain important emails, attachments, folder structure, and metadata, so data loss is not an option. I tried a few manual methods like exporting emails and importing them one by one, but it is very time-consuming and does not work well for large PST files. Some attachments are missing, and the folder hierarchy gets messed up. Is there a safe and reliable way to convert PST files to MBOX without losing any data?