Did you know that:-
Excel can send emails. Imagine sending automatic emails to clients or employees at a click of a button
You can define custom functions. If Excel does not have a function you need, define it yourself
Have you heard of dynamic range names? No need to re-define graph data and lookup tables when you add or delete data
You can design your own pop up windows
You can get a list of all files in a folder and populate a spreadsheet with the file names. Imagine how useful this is
Did you know you can put comments inside formulae? Very useful to make notes as to why you have done something in the formula bar for others to see and for audit purposes
And many, many more.......