A surprising number of "Outlook 2003" users complain of an error using the right-click function. This error disables the function that lets them right-click on messages in their inbox to view a context menu that lets them reply or forward the message (among other options). If you find yourself in this situation, you've got a few options to fix this mysterious bug in your "Outlook 2003" program. Try each option until you find one that works for you.
Open "Outlook 2003" on your computer and wait for the program to start. Click "Tools" from the menu, then click "Customize." Find the option to "Reset Menus & Toolbars" and select it. Restart "Outlook 2003." You should now be able to right-click again.
Search for a file named "FRMCACHE.DAT" using the "Find" function. Rename this file (for example, call it "FRMCACHE.DAT.broken"). Quit then launch "Outlook 2003" to find your right-click function restored.
From the "Start" menu on your computer, select "Run." Enter "%USERPROFILE%\Application Data\Microsoft\Templates" in the field where "USERPROFILE" is your username. Look for a file called "Normal.dot." This stores your "Microsoft Word" templates. Click and drag this file to the Recycle Bin to delete it. Restart "Outlook 2003" to find your right-click function restored.