Outlook OST file may be damaged due to various reasons like virus attacks, hardware malfunctioning etc. To get rid of this situation, you can try to use inbuilt Microsoft Outlook tool called Scanost.exe. It's a very effective tool to fix Outlook corruption issues, but it consumes more time for an absolute result. Therefore, you should try to take the assistance of any professional OST to outlook 2013 converter tool to repair corrupt OST file