Can I open a corrupted OST file without Outlook?

Yes, you can open and view a corrupted OST file without Microsoft Outlook using the SysInfo OST Viewer Tool. It is designed to access healthy, password-protected, oversized, minorly corrupted, and orphaned OST files without requiring an active Outlook, Exchange, or Microsoft 365 profile. The software provides a detailed preview of emails, attachments, contacts, calendars, notes, tasks, headers, MIME data, and RAW HTML content while maintaining the original folder structure. You can also search mailbox data using filters such as sender, recipient, subject, date range, and emails with attachments. After previewing the accessible data, you can export it to PST, EML, MSG, PDF, MBOX, or CSV formats. The tool works independently on your local system, making it useful when the original Outlook profile is unavailable or the Exchange account has been decommissioned. A free demo is available to preview and export up to 100 emails per folder before purchasing the full version.