In Excel 2003, flowchart symbols are available on the Drawing toolbar. To
use it, choose View | Toolbars | Drawing. On the Drawing toolbar, choose
AutoShapes | Flowchart. When you hover the mouse pointer over a symbol, its
name is displayed.
In Excel 2007, choose Insert | (Illustrations) Shapes | ...
After you create the first shape, the Drawing Tools ribbon will appear, and
the connectors are available in the Lines section of the Insert Shapes
group.