Worst sitution for recovering OST files Try OST recovery tool
 

OST to PST Converter Software to recover OST file data along with whole corrupted Outlook OST email items such as - Inbox, outbox, sent mail, note, task, journals and draft etc. By using this application, you can also move recovered OST file into several formats like – PST, HTML, MSG and EML successfully.It can support all versions of 97, 98, 2000, 2003, 2007, 2010, 2013 and 2016.

Download free demo version :- http://www.mannatsoftware.com/kernel...converter.html

Download OST Recovery for easy recovery and conversion of OST files to Outlook PST format without considering their size. It will import whole component of OST files into PST format. It supports all the versions of MS Outlook and Windows OS.
For more info: https://www.downloadtopten.com/recovery/ost/