Microsoft has released Game Voice 1.5. Thanks Mark.
This download is an update for users of the retail Game Voice product. If you don´t have Game Voice 1.0 but would like to try out voice chat, download Game Voice Share 1.5 — the free, chat-only version of the Game Voice software.Download
Please note that Game Voice 1.5 is not backward compatible with earlier versions of Game Voice and that DirectX 8 is now required. Once you install Game Voice 1.5, you will not be able to chat with players using earlier versions of the software, and vice versa.