We're excited to announce that we've fully migrated the Xbox Forums to their new home, here on the Microsoft Community forums!
As of today, going to forums.xbox.com will redirect you here to the Xbox area of the Community forums. We've moved all of your existing threads over so you can continue and start conversations with the new forums experience.
We sincerely appreciate the feedback you have provided over this transition and can't wait for you to check out the new Xbox Forums!
Microsoft switched off the servers for Halo 2 on the original XBOX quite some time ago so if you have the PC version you can only play with other PC players. From the last time I played Halo 2 they had quite a few servers up with people still playing in them
so if you'd like you can play with them :).