Stella outlook password recovery tool is the best way to recover any password from pst files using best password recovery methods. This program can retrieve all pst files 32bit or 64bit as well as recover any encrypted password. This software allows you to recover any key combination password from the pst without having to delete any of your original files.
You can try removing the Password by following the below steps:
Remove a password from an Outlook *. pst File
Right-click on the .pst file name in your folder list.
Choose Properties (Data Files Properties in Outlook 2010 and newer), then the Advanced button.
Click the Change Password button.
Type your password in the Old password field.
Leave the New password and Verify fields blank.