Microsoft announced that they will be closing the original Halo 2 for Xbox servers that has in recent times limited XBL friendlist on xbox 360 to only 100 friends...This has prevented Microsoft from being able to raise the friendlist limit to higher levels - something many had suggested.
Halo 2 Xbox servers will go offline effective April 15th, so you have a few months of playtime with Halo 2 for Xbox.
Announcements are below:
Major Nelson:
http://www.majornelson.com/archive/2...and-games.aspx
Bungie (developers of the Halo franchise):
http://www.bungie.net/news/content.a...news&cid=24704