There was a manual update required that me or my friends couldnt access. it was a manual update that was needed to play games through the internet. you can still develop maps with HEK (halo editing kit) but you cant play online anymore. The manual update link was supposed to be Microsoft Game but that never worked. If anyone is still able to play internet matches, post the link in a reply. They still support updates for Halo 2 Vista but i think they dropped custom edition. I got mine for free though off of the unoffical sort of Halo CE site.