Well, this sucks. On April 15, Xbox Live will cease to support Live features for original Xbox games. This will effectively reduce functionality for many of them.
The Halo 2 community will obviously be the one hardest hit by this decision.
Note that this only effects functions of the games that are actually performed over Live. Compatible Xbox games will still work on 360s, they just won't be able to access Live anymore.
Link

Note that this only effects functions of the games that are actually performed over Live. Compatible Xbox games will still work on 360s, they just won't be able to access Live anymore.
Link