If you want to Convert MBOX file to PST file then I want to tell you there are two way where you can Convert your MBOX file to PST file (i) Manual method (ii) by using any third party tool. Manual method is very hard to use. So I want to Suggest you try this third party tool Regain MBOX to PST Converter Software that can easily Convert your MBOX file to PST file in just few second. just use this software free trial version and see the Original results.
Try this Software free demo version here: http://www.mboxtopstconverter.emltopstutility.com/