Windows has had Tiling functionality since Windows 1.0, but retrofitted onto a stacked manager from Windows 2.0+ (same as Gnome, macOS, etc do). "Side-by-Side"

Windows has had Tiling functionality since Windows 1.0, but retrofitted onto a stacked manager from Windows 2.0+ (same as Gnome, macOS, etc do). "Side-by-Side" (exclusive tiling mode) was added to Windows Vista, and upgraded to "Aero Snap" in 7. It has been iteratively improved from there.