The Xbox 360 was officially unveiled on MTV on May 12, 2005, with detailed launch and game information divulged later that month at the Electronic Entertainment Expo.
On November 6, 2006, Microsoft announced Xbox Live Video, an exclusive video store accessible through the console. Launched on November 22, 2006, the first anniversary of the Xbox 360 launch, the service allows users to download high-definition and standard-definition television shows and movies through Xbox Live onto an Xbox 360 console for viewing.
John Carmack stated at QuakeCon 2005 that the Xbox 360 has "the best development environment I've seen on a console".
The Xbox CPU also contains ROM storing Microsoft private encrypted keys, used to decrypt game data.
Xenos contains 48 unified shader units, which are capable of both vertex and pixel shading operations. This is in contrast to older graphics processor designs which utilize separate specialized units for these tasks.
