TIL the first game Xbox ported to PC was in 2002, Rallisport Challenge

This is a trend that would continue casually throughout the years

With Halo 1 being ported in 2003, Halo 2 and Gears of War in 2007, and so on, finally becoming mandatory around 2016

They also licensed their IP to be ported to other platforms, like Age of Empires on Nintendo DS in 2006