Pst password Remover software can be used to quickly remove the pstfile password. Stella pst Password Remover Software can recover all version 32bit/64bit pstfile passwords. The software also recovers encrypted and unencrypted files passwords. This software recovers all pst file passwords very quickly.
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.