Konami has shared an announcement on the official Metal Gear portal site stating that the online services for Metal Gear Solid V: The Phantom Pain will be terminated on May 31st of 2022. This only affects the Xbox 360 and PlayStation 3 versions. Both MGSV itself and its multiplayer component Metal Gear Online will be shut down on that date. Metal Gear Solid V: Ground Zeroes will also lose its network service on the same date, but this time it also affects the Xbox One and PlayStation 4 versions of the game.
