With the help of WholeClear MBOX to PST Converter to move MBOX to PST file without any changes. This tool simply transfers MBOX files into PST file format. The software will not ask you for the size of Thunderbird MBOX files to transfer PST files. This is truthful software to use this software. It also supports windows like this:- Win 10, 8, 7, XP, Vista, etc.