From Programmed Integration:
In Outlook Express, if you neglect to select the command "Exit and Log Off Identity", when the next person opens Outlook they will be logged in as you. SecureOutlook gets around this problem, by launching Outlook for you. When it opens Outlook the default login is ignored and also when Outlook closes, the default login is ignored. Thus whenever you enter Outlook Express via SecureOutlook you are greeted with the familiar login Screen.