I am managing a large number of emails stored in Thunderbird and MBOX files, and now I need to convert them in bulk to other formats like PST, EML, PDF, HTML, or MSG. The problem is that manual methods are very time-consuming and do not work well for bulk data. I am also concerned about email integrity, attachments, folder hierarchy, and metadata during the conversion process. Is there any reliable and efficient solution to convert Thunderbird and MBOX files in bulk without losing data?