If you have locked your Outlook PST file with a password and have now forgotten the password, then there is no need to panic. I recently used the DataVare Outlook PST Password Recovery Expert Tool, and this tool is really very easy and effective.

Key Features:

Remove or recover a password from any size PST file
Compatible with any Outlook version (from 2003 to 2021)
No technical knowledge required, the work is done in just 2-3 clicks
The demo version is also available so that you can test it first
I myself used it after forgetting the password of an old PST file, and the password was recovered within minutes. No data loss, no hassle.
If you are also facing a similar problem, then definitely try this tool once.