if you loose Outlook .PST password you can use this software PstPassword 1.02, PstPassword is a small tool that will recover lost password of Outlook .PST (Personal Folders) file.

Using PstPassword
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 SettingsUser NameLocal SettingsApplication DataMicrosoftOutlook). 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 0×00000000.

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

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