I see a new problem that has been discussed in more than one forum: as far as I can tell, no one can get online on PC Halo 2 period. This has been going on for 2 to 3 days as of this post. We can connect to Windows Live and talk to friends and voice chat, we can play on our LAN servers, we can host a game by ourselves with no one else, and we can do the campaign. The only thing we can't do is join online games and get people to join the online games we create.
I don't know about everyone else, but personally, I just got on the computer, chatting with a friend. We felt like playing a few games of Halo 2. (Keep in mind I did nothing to my computer ever since I got on Halo 2 last time we played, and my friend didn't do anything either.) When we came on, not only could he not join me and I couldn't join him, but no one else joined our own games, and we couldn't join or see anyone else's! We decided to play Halo 1 that day.
It seams as if Microsoft or Bungie suddenly decide to shut down the PC Halo 2 servers without telling us. Did they, or is this a problem that needs to be resolved?