I've been playing some Fable 3 co-op, and I can't figure it out!
How can I chat with my co-op partner?
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This might help.
The answer is essentially that you can't. You can invite them to a party (XBox) or open a chat (Games for Windows Live) or something similar. But there isn't a built-in chat client, sorry.
Yes you can! Just plug in your mic and it should work.