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For MBOX to PST Conversion you can use this third party tool Regain MBOX to PST Converter that can provides us safe and easy MBOX to PST Conversion. The software provides simple GUI, which easy for utilization by anybody to convert MBOX files to multiple formats in both single-mode and batch mode. User can also try this Software free demo version where you can save 30 emails per folder at free of cost.

You can download this Software free demo version from here: 
https://download.cnet.com/Regain-MBOX-to-PST-Converter-Software/3000-2369_4-77945666.html