Recently I had a major fail with Outlook 10. I was able to restore the program and some of its sub-programs (calendar but empty, contacts complete, and very recent emails). I wanted to restore some older emails and found I had an old Outlook Data.pst file in a restored files folder, but when I tried to open it I was required to have a password. I have no idea what password is needed as I never had one, nor how to get one for this. My general MS password didn't work.
I did not find the right solution from the internet
References : https://www.cnet.com/forums/discussions/outlook-data-files-password-protected/
B2B Marketing Campaign