Kernel for MBOX to PST software is available in free trial version. You can download MBOX to PST software’s free version to migrate large number of MBOX files to MS Outlook. However, trial version lets you save only 25 items per folder. To save desired number of MBOX files to Outlook PST format, you need to purchase the software. Interestingly, the software supports data migration from 20 MBOX email clients including AppleMail, Netscape etc.