The safest and most practical way to remove or reset a forgotten password from an Outlook PST file is to use a trusted MailsDaddy
PST Password Remover tool. It works directly on the secured PST file and removes or resets the protection while keeping all emails, attachments, contacts, calendars, and folder structure completely intact. The tool supports both ANSI and Unicode PST formats and is compatible with all major Microsoft Outlook versions, which makes it suitable for both old and new mailbox files. Within a few seconds, the file becomes accessible again in Outlook without asking for the old password.