And the Mac version was a very different game from what Halo on the Xbox turned into. You can find old trailers. Among other things I think it was 3rd person with a heavier emphasis on vehicles.

The Mac version was the same as all the others at release, Microsoft had Bungie dumb it down for the Xbox. The trailers you are watching are for what HALO was suppose to be, not what it ended up being.

I know. I was referring to the original design for the game before MS bought Bungie.

As I remember the Mac version of the Xbox game didn't get released until years after the Xbox.

I own and still play Halo for Mac frequently. Not sure what you mean.

I wasn't aware years later another company ported the original Halo.

It was released by Bungie/Microsoft for Mac at about the same time as they released the desktop PC version.