To Save many EML files into MBOX format, I suggest you try ZOOK EML to MBOX Converter. It allows you to Save EML files into Thunderbird, Mac Mail, Eudora, Entourage, and many other MBOX-based email clients, as well as batch convert EML files to MBOX format. With only one click, the tool's batch mode enables users to choose a folder full of EML files and convert them to MBOX format. Additionally, it provides the option to save the generated MBOX file with the chosen file name and location. Users can choose the EML to MBOX converter free version to evaluate the tool's effectiveness.