If you want a simple way to recover a PST file password, try Advik PST Password Recovery Tool. It helped me unlock an old PST file with a forgotten password. The tool can unlock several PST files at once without losing any data. Its easy-to-use design makes it perfect even for beginners. It works on Windows 11, 10, 8.1, 8, and 7, and you don't need to have Outlook installed. You can try the free demo version before buying the full tool.