This question has been asked several times by several people, and the answer
is yet to be forthcoming.  When I (we) send a message in either Outlook 2003
or 2007, the sent messages have suddenly stopped being saved in the "Sent
Items" box.  Now this seems very much like a programming "bug" to me -- so
many others have the same problem.  All the "configuration" settings are
correct (on my machine), after many hours of setting, re-setting, and
checking.  Still, the sent messages are "gone" forever.  As far as I am
concerned, this is a desperate situation.  Like the others, I NEED those
messages saved.  Does *anybody* have any idea what the problem might be?  The
suggestions so far offered just don't seem to solve the problem.