When you open an Excel 2007 workbook there are 2 sets of border icons. One
set allows you to minimise, maximise or close the workbook. The other set
should do the same for the application but the close icon does not work - it
just closes the active workbook. Is there somewhere errors like this can be
reported? It seems silly if they designed it that way - what is the point
of having 2 buttons to close a workbook and no button to close the
application?

(I know I can do it with Alt-F4 but that can be dangerous if you have
clicked outside the Excel window without realising it).