If you are looking for a way to convert your MBOX files into NSF format, you can try advanced MBOX to NSF Converter tool of SysInfoTools. It performs conversion of normal as well as corrupted MBOX files without causing any changes or data loss. It creates new NSF file at user-defined location or saves MBOX file's data into the existing NSF file. Any technical and non-technical user can use this tool with ease.