Outlook 2000

You certainly can.

open outlook, click on Tools on the menu bar, click on accounts, click on mail tab.

You should see your account that you are using, make sure it is selected then click on properties, click on the servers tab, you will see your user name and password, below the password line there is a remember password box, uncheck that box, and if you want, click on use secure password authentification.

Click on OK close all dialog boxes, close outlook 2000 and open it again, now you will need a password to access your mail.