Remove a Password From a *.PST File

You need to use two utilities to remove the password:

pst19upg.exe

scanpst.exe - This is installed when you install Outlook. It should be in your Office folder, under Program files- usually C:\Program Files\Microsoft Office\OfficeXX (where XX is the version number)  or use Windows Search to find it. 

If this method doesn't work, you'll need a commercial password cracker program.

This will not work on Outlook 2003's Unicode format pst.

Tip:

Make sure you have plenty of free space available - the utilities will need approximately 3 times the size of the pst to work with.

Steps

1. Close Outlook and make a copy of the PST file to work with.
2. Run scanpst.exe on the copy of your pst and choose Repair, if prompted. There is no need to use the backup option in ScanPST, since you are working with a copy.
3. Open a Command Prompt (Start menu, Run) and paste or type the file path to pst19up and your pst name: pst19upg.exe -x filename.pst and hit enter.
   The command line will resemble
   "C:\My Documents\pst19upg.exe" -x outlook.pst
   This will create a copy of the pst called "filename.psx" (where filename is the same name as the original pst file).
4. When complete, rename the original pst file to something else, such as filename.old.
5. At the command prompt, type pst19upg.exe -i filename.psx and hit enter. Remember, you need to use the full path to pst19upg.
6. This creates a password-free pst file from the psx file.
7. Run scanpst.exe against recovered pst and choose Repair, if prompted. As before, you don't need to make a backup using ScanPST because you are working with the backup.
8. Open the file in Outlook using the File, Open, Outlook Data file menu.

Tools