Halo PC refers to the version of Halo: Combat Evolved built for home computers including both the PC and Mac platforms. Halo: Combat Evolved was originally planned to be made for the Mac platform. Bungie changed platforms to the upcoming Xbox after being purchased by Microsoft in 2000. On September 30, 2003, Gearbox Software ported Halo for the PC and added a few extra features as well. Later, a Macintosh version of Halo was made, referred to as Halo Mac.