If you are facing issues like synchronization errors, inaccessible mailboxes, or Outlook crashes, it means your OST file may be damaged. To Repair corrupted OST file manually, you can try using the Inbox Repair Tool (ScanPST), but it often fails with severe corruption and large OST files.

For a reliable and secure solution, you can use vsoftawre OST Repair Tool. It efficiently scans and repairs corrupted OST files without data loss. The software restores emails, contacts, calendars, attachments, and other mailbox items with complete folder hierarchy. It also allows you to export repaired data into PST format, making it easy to access in Outlook again.