I recently needed to open an old Outlook PST file, but I had forgotten the password. After a lot of trouble, I found
Softaken PST Password Removal Tool – and to be honest, this tool came in handy.
What's special?
Access a PST file without a password
No size limit – supports large PSTs too
Clean interface
Outlook 2019, 2016, 2013, and all versions are supported
I have used it myself and am completely satisfied. If you have also forgotten your PST password, then definitely try this tool once.