Add a Password to Your Outlook *.PST

You can password protect your Outlook *.pst file.

1. Go to the top level of your folder, where Outlook Today is found. The folder name may include "Outlook Today" or your email account name.
2. Right click on it and choose "Properties for [name]"
3. Click the Advanced button on the dialog.
4. Click the Change Password button.
5. Type in your New password.

If you are changing an existing password, type both the old and new passwords in the respective fields. When you open Outlook, you'll be asked for the password. This will prevent someone from opening Outlook and viewing your email. If Outlook is open, anyone using your computer can access your email - to protect it, you either need to close Outlook or lock the desktop when you walk away by pressing the Windows+L key.

Use a password you will remember because passwords can be difficult to recover.  See Tools and More Information below for assistance with lost PST passwords.  

Tools

More Information