OST Repair
If your .ost file becomes damaged, Outlook includes a tool scanost.exe that may be able to correct the problem. This tool, the OST Integrity Tool, can scan and repair .ost files. If that doesn’t completely solve the problem, you can disable the .ost file and create a new one.
Once the file is repaired sucessfully then you can use the Convert OST tool to recover emails from ost file.
