For converting MBOX files you can use MBOX to Gmail software. This tool support all types of MBOX files with extension or without an extension like MBX, MBS, MBOX, etc. With this software, you can convert batch MBOX files at once without any error. Also preserves the data integrity during the conversion process and gives 100% precise results of the conversion process. Both Windows and Mac users can convert MBOX files with this utility safely. The tool has a very easy GUI that non-technical users easily convert their MBOX files without any confusion. The software is compatible with all MBOX files of supported apps including Mozilla Thunderbird, Apple Mail, Opera Mail, Eudora, Entourage, SeaMonkey, PocoMail, Postbox, Spicebird, etc.