For commencing OST to Outlook Converter, use outside application like OST Recovery software. The software deals with corrupted OST data (calendaring schedules, contacts, journals entries, to do list, etc) with no data left without conversion. Amongst many FREE services, one useful FREE facility is DEMO.
There are many benefits if you firstly opt for free download before the commencement of complete process.
With FREE trial run, you will be able to get preview of recovered OST files and converted OST files in other format. Evaluate and determine features completely, afterwards buy this app in full mode to save all recovered and converted OST files at the location you desire for.