Try the demo version of the JDR NSF to MBOX Converter Software and convert your data but if you want to convert complete data then you must purchase a full version of the software because the demo has come with limitations on the saving process. In addition to MBOX conversion, the tool can also act as a Lotus Notes NSF to PST converter, enabling migrations to Microsoft Outlook if needed. It let you export NSF files to PST, EML, MSG, PDF, Office 365, Gmail/Suite & Live Exchange Server. Whether you are importing the converted file to Thunderbird, Apple Mail, or another client, the import NSF to MBOX file feature works seamlessly across platforms. Before proceeding with the full migration, you can preview the NSF files and select specific items for conversion. Read more - https://apps.microsoft.com/detail/9msxsgs9mjpb?hl=en-US&gl=IN