To Save EML files into MBOX format? Then I will recommend you can also try
ZOOK EML to MBOX Converter.It is the best solution for users to save EML files as MBOX format.It offers to batch convert EML 2 MBOX format for Thunderbird, Mac Mail, or any MBOX based email clients. It is the direct method to import EML files to Thunderbird or any MBOX supporting email application. EML to MBOX Converter offers you to convert multiple EML files to MBOX format without losing any data.
Users only need to follow these easy steps to convert EML to MBOX.1. Download and Install ZOOK EML to MBOX Converter
2. Depending on the requirements for the conversion, click "Select Files" and "Select Folders."
3. To store the generated data, select "Browse" and specify the file storage destination.
4.The last action is to "Click" the convert button.
Check for more details at:
Best Solution to Save EML files into MBOX format