This is the final installment of the Xbox Live Services on Windows Phone 7 Series at GDC. We have additional videos on 3D games coming up, but check out this last snippet from the Microsoft talk along with some questions from the audience. As with all the talks at GDC, Microsoft had a recurring theme: wait for MIX10 for the final answers.

Be sure to also check out:

1. Part I

2. Part II

3. Part III with push notifications.