The multiplayer aspect of Medieval: Total War is still active. With the release of Medieval 2: Total War, the future is uncertain. The community is divided between non-expansion Medieval: Total War (MTW) and Viking Invasion Expansion Pack (VI). VI players cannot join MTW games and vice versa. The two do share the main lobby however. The game survives mainly on the network of clans in place. However since then, many players have stayed in MTW. Some players never bothered to buy the expansion pack when it was released and others prefer MTW because of the differences between it and VI (see below).
The multiplayer aspect of the game is real time battle only. The campaign cannot be played multiplayer.