The recycled license market is readily accessible on eBay.  There are other sites, too, but that's the one I use.

Excel is the granddaddy of all electronic spreadsheet programs.  Of course it can be used to create and edit spreadsheets - it practically invented them.
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Brian - Windows 10 Home, 64-Bit, Version 1809, Build 17763  

A great deal of intelligence can be invested in ignorance when the need for illusion is deep.

          ~ Saul Bellow, To Jerusalem and Back