To get password to PST file (Outlook versions supported: 97, 98, 2000, 2002/XP, 2003, 2007, 2010, 2013, 2016, 2019), simply select the file you want to recover the password(s) for: press the Open PST file button and select an appropriate PST-file. If the given file is corrupted, or used by another application, or not password-protected – appropriate error message will be displayed. Otherwise, the password will be recovered immediately, shown in the message box and written to the log window. You can copy recovered password to Clipboard and run Outlook just from EINPB, put the cursor into the password box, and press Ctrl-V or Ctrl-Ins there to paste the password from the Clipboard (to avoid mistyping).
Please note that in some cases, the password recovered by EINPB is not the same as the one which has been originally set. That's due to encryption algorithm used in Outlook – the original password is not stored in the file. But that password (shown by EINPB) will be accepted by Outlook without problems – just try. And of course, after logging into Outlook, you'll be able to change that password to any one, or just remove it.