Outlook Express

You may have set the full screen option ,go to view menu in outlook and then click layout,if this does not solve your problem,the go to the top of the right corner and minimize the window,no when you maximize the window,go to side when pointer changes to arrow pull the side in
also there is no scroll bar for less than ten messages

Reduce the size of the Message paine vertically by dragging it up until the scroll bar appears . You have probably set up a filter to Hide read and ignored messages on the view Menu . Change this to show all Messages . The Scroll bar should now appear .

Good Luck !