Hey, I am suggesting you use OST to PST Converter to convert your OST files to PST files. This software is also able to recover ost files to many formats like contacts, zip attachments, embedded images, journals, tasks, calendars, distribution lists, draft folders, etc. This software has a spilt option for all user, who wants to reduce their oversized data into small PST files. The software supports all the versions of MS Outlook as well as any Windows OS and preview option before the conversion.
Read More - Export an OST file to PST free
Read More - Export an OST file to PST free