We are about to reach the end of a very important era for Xbox–well, in about a year. Microsoft has announced that in December 2021, it will be taking Xbox 360 services offline for the Halo series. This move will affect seven different games, including two games in the original trilogy, limiting or completely disabling online matchmaking.
In a post on Halo Waypoint, 343 Industries said that it takes a great deal of resources in order to maintain the services for these games. Total player-count has been dwindling as more players choose to play the Xbox One or PC versions through the Master Chief Collection, and the Xbox 360 versions haven’t even been available to purchase physically for about two years.
Halo Xbox 360 services are going offline in December 2021. Games remain playable indefinitely, but some experiences will be impacted.
— Halo (@Halo) December 18, 2020
The games affected are listed below: