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.
Xbox One
At its launch, the Xbox One did not have native backward compatibility with original Xbox or Xbox 360 games. It had been a desired launch feature by Microsoft and had been actively under development as early as 2007 under the "Trioxide" program as to get Xbox 360 code to run on 64-bit hardware. Rather than going the route of the initial PlayStation 3 which included a core PlayStation 2 system-on-a-chip processor, the Xbox One hardware was designed to include support for Xbox 360 XMA and texture processing on hardware, knowing this would be difficult to replicate in software. Following criticism of its plan for an "always on" console from the May 2013 announcement, Microsoft had to put significant effort to prepare the Xbox One software for a revised approach, and the backwards compatibility development work were put on hold. Interim solutions were suggested: senior project management and planning director Albert Penello explained that Microsoft was initially considering a cloud gaming platform to enable backward compatibility, but he felt it would be "problematic" due to varying internet connection qualities. Xbox Live director of programming Larry "Major Nelson" Hryb did state that users could theoretically use the HDMI-in port on the console to pass an Xbox 360 (or, alternatively, any other device that supports HDMI output, including competing consoles) through Xbox One. This process does generate a small amount of unnoticeable display lag.