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Codename '''Fission''' is the official [[Xbox emulators|Xbox]] and [[Xbox 360 emulators|Xbox 360]] emulator made by Microsoft to allow for backwards compatibility on the [[Xbox One emulators|Xbox One]] and [[Xbox Series X and Series S|Xbox Series X/S]].  However with November 2021 update Microsoft ends the program and said: "This latest and final addition of 70+ titles to the backwards compatibility program was only possible through the passion and feedback from the community," Microsoft said. "Your constant requests for specific titles and enhancements encouraged the Backwards Compatibility team to partner with the original creators to preserve thousands of games from over four generations of Xbox. While we continue to stay focused on preserving and enhancing the art form of games, we have reached the limit of our ability to bring new games to the catalog from the past due to licensing, legal and technical constraints. Thank you for being part of this journey with us."<ref>https://www.gamespot.com/articles/xbox-backwards-compatibility-adds-70-more-games-today-as-microsoft-ends-the-program/1100-6498021/</ref>

Its development was announced in June 2015 and the first batch of games were released on November 12. It was originally released as an Xbox 360 only emulator, but original Xbox emulation was later added in 2017 due to popular demand. The latest last batch of games were added to the emulator on June 10November 15, 20192021, as Microsoft announced they were focusing on Xbox One game emulation for the Xbox Series X/Sdue to licensing and technical issues.<ref>[https://wwwweb.engadgetarchive.org/web/20211115215743/https://news.xbox.com/2019en-06-10us/2021/11/15/70-xboxnew-backward-compatibilitycompatible-scarlett.html Microsoft's Xbox, games/ Celebrate 20 years of Xbox 360 backward compatibility list ends herewith over 70 new Backward Compatible Games]</ref>. It supports 477 632 Xbox 360 games and 42 63 original Xbox games<ref>[https://www.xbox.com/en-US/games/backward-compatibility Official compatibility list]</ref>.

Backwards Most backwards compatible games can be purchased or and downloaded through the Microsoft store, or inserted via the disc drive. Unlike the previous [[FU|Fusion]] emulator for the 360, games do not run directly from the disc, and the Xbox One or Series X/S must be connected to the internet for DRM purposes. When a disc is inserted, a prompt saying an update is required to start the game will appear, accepting the prompt will download a repackaged version of the game to fit the Xbox One or Series X/S format.