If you have an orphaned or corrupted OST file then the EdbMails OST Recovery tool that Convert OST to PST is exactly what you need. Retrieve all OST contents including attachments, all email properties like cc, bcc, to/from address with just a few clicks using EdbMails.
Some of the reasons for OST corruption can be:
Network issues leading to synchronization errors
System failure
Abrupt termination of Outlook
Virus or other such malicious infection
Feature of the OST Recovery tool from EdbMails include:
Repair corrupted OST file and convert it to PST.
Maintains the folder structure intact.
All the data such as inbox items, sent items, contacts, etc will be recovered.
No limitation to the size of the OST file that can be recovered.
OST viewer to preview all OST data.
The free version of the tool to test out all its features and export up to 30 items per mailbox/folder.