If you have password-protected PST files and you want to open them without Microsoft Outlook. You can use a dedicated MailsDaddy
PST Password Remover tool, which is designed to open password-protected PST files without requiring Microsoft Outlook and the original password. The tool helps users to remove or reset the password of the locked PST file while maintaining the mailbox data. It helps to unlock encrypted PST files and regain the access of your mailbox data. After removing the password, you can use a compatible PST viewer to access the file without Outlook.