To unlock a secured PST file without losing any emails, you can use the SysInfo Outlook PST Unlocker Tool. This easy-to-use software allows you to remove passwords from encrypted PST files in just a few simple steps. You just need to add the locked PST file, click on “Remove Password,” and the tool will unlock the file without altering any of its data. It supports both ANSI and Unicode PST files and works with all versions of Outlook. If needed, you can also set a new password for the unlocked file.