If you want to efficiently import EML emails into MBOX format, then try the TrustVare EML to MBOX Converter. This simple utility lets you swiftly import EML files into MBOX without any data loss. Many EML files can be converted, and it maintains all of your emails, attachments, and folders throughout the conversion. It operates with well-known email clients such as Thunderbird, Apple Mail, and others. There are no requirements for any additional program. The program operates on all Windows versions. The free demo version lets you try it as well to see how it performs before purchase. Visit the official website and import your EML files into MBOX format.