I recently had to export MBOX Mailboxes to EML Format with all of their attachments. I tried a few different tools and found that WholeClear MBOX to EML Converter worked the best. It was really simple to use, and the conversion went quickly. I liked that it made sure that every email was the same, right down to the files, subject lines, and formatting. It converts bulk mbox files to EML at once with attachments. It also worked well with MBOX files from Thunderbird and didn't lose any data. This utility supports all versions of Windows OS, such as Windows 11, 10, 8, 8.1, 7, XP, Vista, etc.