Outlook has one of the weakest encryption for protecting a locked .PST file, as each .PST file can be opened with three passwords, One of them may be the original password that the client entered, or all 3 might be different to the original. But there might be a issue when you forget the password of the locked .pst file, but in such a case this free program called PstPassword comes to rescue. It allows you to recover the password from the locked original file.
This application works with Outlook 97, 2000, XP, 2003 and 2007, you don’t even need Outlook installed to use this program. You only need the original PST file.
We have previously written about a similar utility which allows you to recover or extract email account password with the tool called MailPassView