Ah this issue i remember once i had same issue and it was really frustrating for me because it was a extremely important file to me and i couldn't able to remember the password of my PST file and i didn't wanted to mess it up with manual way so i started to find resolution online and i found Kernel PST Password Recovery and man it was a life saver for me and the BEST part it free i haven't paid a single dollar for this tool.
https://www.nucleustechnologies.com/outlook-password-recovery.html
Kazuya Mishima
Ah this issue i remember once i had same issue and it was really frustrating for me because it was a extremely important file to me and i couldn't able to remember the password of my PST file and i didn't wanted to mess it up with manual way so i started to find resolution online and i found Kernel PST Password Recovery and man it was a life saver for me and the BEST part it free i haven't paid a single dollar for this tool.
https://www.nucleustechnologies.com/outlook-password-recovery.html