How to Put a Password on an Email in Outlook
Outlook is an email, contact and calendar management tool made by Microsoft. If you use Outlook on a shared computer, you can set up a password to protect your email and prohibit anyone from reading your email and viewing your Outlook data. It only takes about three minutes to set up this password.
Turn on your computer and launch your Outlook application.
Click "File" in the main menu bar, then scroll down and click "Data File Management." Click the "Data Files" tab, and select the "Personal Folders file," then "Settings."
Click on the "Change password" button and enter your new password in the appropriate field. Type your new password in the "Verify password" box.
Make sure there is not a check mark in the box next to "Save this password in your password list." Click "OK" two times, then "Close."