If you are unable to open a corrupted or inaccessible PST file, you can use MailsDaddy Free PST Viewer to check and access the available mailbox data. It supports healthy as well as damaged PST files and allows you to preview emails, attachments, contacts, calendars, and other mailbox items. You can also browse the original folder structure and search for specific emails using sender, recipient, or subject details. I would suggest giving this tool a try, as it provides a simple way to inspect PST files and check whether your important mailbox data is readable