Calculator debuted in Windows 1 (1985). It is one of only a few apps to appear in every version of Windows. Initially basic, it gained many features over time, such as scientific (Windows 3, 1990) & programmer (Windows 7, 2009) modes. Learn more @ youtu.be/RokcyHmoymE! 🧮👀 #DailyWindowsFacts #Microsoft #Windows #Calculator #Windows1 #Windows3 #Windows7 #Windows10