You need a proper solution to move MBOX to PST format therefore i would like to suggest MailsDaddy MBOX to PST converter tool. This single solution supports more then 25 email client that provides 100% secure output in a new PST file. User can install the software on different Windows OS and open MBOX to PST format at once. The free demo version of the software convert up to 20 emails from each mailbox. Read more: convert mbox to outlook