OST error can't be recovered through scanpst.exe, so you have to use other recovery tools such as OST to PST Converter which can converts and restores OST files at a user preferred location. It is an uninterrupted and speedy conversion process which allows user email file conversion at the highest speed with accuracy.The complete performance is risk-free conversion without wasting much of time which comes available in free trial version also.you'll to say that while corruption the likelihood to scan OST file data is became a lot of possibility able.

Download :-http://email-recovery-utility.blogspot.in/p/ost-2-pst-converter-tool.html

Download Regain 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.

For more detail visit here :- http://www.convertosttopstfiletool.com

I would suggest you to go for manual techniques like Import & export.

Process: 

Open MS Outlook & click File menu.

Select the “Import and Export” wizard.

Now click the “Export to a file” option and then click Next button.

Select Personal File Folder (.pst) and then click Next button.

Select items to be exported or Click on parent root and check the Include sub-folders option.

Browse and select the target folder for saving the email items.

Click the Finish button.

Hope this process works. If it doesn’t work, you may also checkout the EasyTechTools BLOG for more manual procedures.
How To Convert OST Files To PST

 Hope this answer helps