If you have problems opening your .ost file, you can use the Inbox Repair tool (Scanpst.exe) to diagnose and repair errors
in your .ost file. The Inbox Repair tool (Scanpst.exe) can be used on your .ost file as well as Personal Folders file (.pst).
The tool scans the .ost or .pst file, and makes sure that the file structure is intact. It does not interact with your
Inbox on the server running Exchange server in any way.
More Key Features: OST to PST Converter
*Instantly Convert OST to PST File
*Repair corrupt or inaccessible offline .ost files
*Show Preview of All Converted Emails in Free Version
*Save Converted Emails in PST, MSG, EML, RTF, HTML, and PDF formats
*No restriction on file size when converting OST to PST File
*Support all versions of MS Outlook and Exchange Server
*Use Free Trial Version
Know more detail :- http://www.osttopstconverter-tool.com