Xbox Live
When the Xbox launched on November 15, 2001, the as-yet unnamed online service was destined for a Summer 2002 deployment. Xbox Live was finally given a name at E3 2002 when the service was unveiled in its entirety. Sound-dampened booths and broadband-connected Xbox consoles—featuring an early version of "Unreal Championship"—demonstrated the service on the show floor. The Epic title was one of the flagship titles for the service, which was slated for a debut on November 15, 2002, marking the anniversary of the Xbox launch. Microsoft announced that 50 Xbox Live titles would be available by the end of 2003. Utilizing the required broadband bandwidth, Xbox Live featured a unified gaming "Friends List", as well as a single identity across all titles (regardless of the publisher), and standardized voice chat with a headset and communication, a feature that was still in its infancy.
List of backward compatible games for Xbox One
During Microsoft's E3 2015 press conference on June 15, 2015, Microsoft announced plans to introduce Xbox 360 backward compatibility on the Xbox One at no additional cost. Supported Xbox 360 games will run within an emulator and have access to certain Xbox One features, such as recording and broadcasting gameplay. Games do not run directly from discs. A relicensed form of the game is downloaded automatically when a supported game is inserted, instead of having to make extensive modifications to the game in-order to port the original title. This means that the only reason every single Xbox 360 title is not available is a licensing issue, not an engineering one. All Xbox 360 games could run out-of-the-box on Xbox One, as they require no modifications or porting to run, other than a valid license. While digitally-purchased games will automatically appear for download in the user's library once available. As with Xbox One titles, if the game is installed using physical media, the disc is still required for validation purposes.