PstPassword doesn't require any installation process or additional dll files. In order to start using it, just run the executable file, PstPassword.exe After you run PstPassword, the main window displays the list of all PST files of the current logged on user (Under Documents and Settings/User Name/Local Settings/Application Data/Microsoft/Outlook). For each password-protected PST file, PstPassword provide 3 alternative passwords that will open the PST file. If the PST is not protected by a password, the 3 password columns remain empty, and the CRC value column is 0x00000000. If you want to recover a password of PST file that doesn't appear in the Default list, you can press F7 and select the desired PST file, or simply drag the PST file from Explorer window into the main window of PstPassword. If from some reason PstPassword fails to read a PST file, an error message is displayed under the error column, and the item is painted with pink color.