Biggest commercial supplier of OS and surrounding software suits. Everybody think Microsoft Windows is a computer, same as WiFi = Internet. International trade is based on Excel, science, probably government and your Warhammer 40k Army list as well. Can’t properly determine leap year.

(Also when dumping genetic strings, these long AAACGCG, into Excel it turns them into dates silently. Which has ruined the reproducibility of genetics research since forever.)