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
Following the release of the Xbox One and transition of Phil Spencer to the head of the Xbox division in 2014, he and software engineering vice president Kareem Choudhry restarted the backwards compatibility program in relative secret within the company. Choudhry brought on previous engineers that worked on Trioxide, including Kevin La Chapelle, Jonathan Morrison, and Barry Bond, to restart the program. The team chose to start with "Castle Crashers", which included Xbox networking features, to test backwards compatibility. "Castle Crashers" frequently crashed to a screen with alphanumeric codes, which La Chapelle was able to obtain from the game's developers, The Behemoth, which helped them to rapidly diagnose problems and fix the compatibility issues. Solving most of the major problems through "Castle Crashers", the background compatibility team decided to let the program be announced at E3 2015 with plans to have one hundred titles available by the end of 2015. However, by E3, they still found problems with some games running at extremely low framerates. During the event, Morrison recognized that a fundamental difference between the Xbox 360 and Xbox One was its scheduling rate, and when they returned, Morrison's idea helped them to rapidly complete work to meet its promised goal by the end of that year. Individual games still brought some difficulty, specifically "", but this prompted the team to develop automatic tools that could be used to identify where Xbox 360 titles would be difficult to run as-is on the Xbox One and how to work around those; this further set up the potential to improve Xbox 360 games on the future iterations of the Xbox One, such as the Xbox One X to improve graphics support.