Want to remove password for PST file.Then you can try the PST19UPG.EXE, it is a free utility tool that provided by Microsoft to remove the password from PST file. But PST19UPG.EXE only work on ANSI PTS format and older version of MS Outlook, it doesn't work on UNICODE PST file.
If you have UNICODE PST file format or Latest version of MS then you should download PST Password Recovery tool from the internet.