When Outlook won’t open an OST due to corruption, orphaning, or profile issues, the best OST to PST converter software helps you extract mailbox data and save it into a healthy PST you can import into Outlook. Professional tools are designed to convert inaccessible/corrupt OST data—including emails, attachments, contacts, calendars, tasks, and notes—without relying on the original Exchange/IMAP connection.
Look for a converter that supports scanning damaged or offline OST files, offers a preview before export, and preserves folder structure and email properties for reliable recovery.
If the OST is only slightly damaged, Microsoft also provides the Inbox Repair Tool (ScanPST.exe) to repair PST/OST issues, but severe corruption often needs a dedicated converter to recover and export data successfully.
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