If you also want to convert the MBOX file into a bulk inside the EML file in Bulk, then you can use eSoftTools MBOX Converter software which imports easily. This software can convert every single file and using this software you can export any file without losing any data. There is no risk of any kind by using it. Also, it is both technical and non-technical. By downloading it, you can convert 25 items for free, that too under the free demo.