An unreadable PST file may indicate corruption or damage, so it may not open normally in Outlook. In such cases, a PST viewer can help determine whether any mailbox data remains accessible. Aryson PST Viewer Tool can scan PST files and provide a preview of available emails, attachments, and folders. Read More: https://www.arysontechnologies.com/how-to/open-pst-file-without-outlook/