To repair a corrupted OST file without losing Outlook data, first create a backup copy of the original OST file and avoid making changes to it. If Outlook can still access the mailbox, allow it to synchronize completely with the Exchange or Microsoft 365 server. For severely corrupted, inaccessible, or orphaned OST files, a dedicated recovery solution can extract the available mailbox data safely. Aryson OST Recovery can scan corrupted or damaged OST files using Standard, Advanced, or Deep recovery modes and preview recovered emails, contacts, calendars, tasks, journals, and attachments before saving them. According to the provided source, the recovered data can be exported to PST, EML, MSG, MBOX, DBX, or Archive formats while maintaining the folder hierarchy. The tool also supports encrypted and oversized OST files. This approach lets you preview the recoverable data first and save the required Outlook items without modifying the original corrupted OST file.
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