Xbox system software

The Xbox system software is the operating system developed exclusively for Microsoft's Xbox home video game consoles. Across the four generations of Xbox consoles, the software has been based on a version of Microsoft Windows and incorporating DirectX features optimized for the consoles. The user interface, the Xbox Dashboard, provides access to games, media players, the Xbox operating system provides standardized tools that facilitate game development specifically for Xbox, potentially limiting portability, and applications, and integrates with the Xbox network for online functionality.

Though initial iterations of the software for the original Xbox and Xbox 360 were based on heavily modified versions of Windows, the newer consoles feature operating systems that are highly compatible with Microsoft's desktop operating systems, allowing for shared applications and ease-of-development between personal computers and the Xbox line.

Across all four generations of the Xbox platform, the user interface of the system software has been called the Xbox Dashboard. While its appearance and detailed functions have varied between console generations, the Dashboard has provided the user the means to start a game from the optical media loaded into the console or off the console's storage, launch audio and video players to play optical media discs, or start special applications for the Xbox such as streaming media services from third parties. The Dashboard also provides a menu of settings and configuration pages for the console that the user can adjust.

The Dashboard has supported integration with the Xbox Live service since November 2002. Xbox Live provides online functionality to the Xbox, including a friends list, game achievement tracking, matchmaking support for online games, in-game communications, and a digital game storefront. While some portions of the Xbox Live service are free, a subscription-tier Xbox Live Gold is generally required to play most multiplayer games on the console.

Starting with the Xbox 360 and continuing through its current consoles, Microsoft has offered a means for users to opt into a beta test version of the console's system software. When first launched for the Xbox 360 in September 2010, this was called the Xbox Live Preview Program, and initially required an invitation from Microsoft after applying for the program. On the release of the Xbox One in 2013, the program was renamed to Xbox Preview Program, and Microsoft made this program open to all rather than restricting through invitation. Later in November 2016 rebranded to the Xbox Insider Program, corresponding to the similar Windows Insider program for those testing its computer operating system. With the Xbox Insider Program, testing not only included updates to the system software but upcoming game and application patches from both first and third-parties.

Each iteration of the Xbox software has brought some form of backward compatibility to the newer console. On the Xbox 360, selected original Xbox games could be played through emulation after downloading an emulation profile to local storage. The Xbox One was not initially shipped with backward compatibility support, but was later added by January 2015 by another emulator to support selected Xbox 360 games, with hundreds of titles added over the following years. A similar emulator was developed and released in October 2017 for the Xbox One for a limited selection of original Xbox console games. Achieving Xbox One-backward compatibility on the Xbox Series X and Series S was a target goal for the newer consoles, and as such, these new consoles are fully backward compatible with all games in the Xbox One library with the exception of those requiring Kinect support. The supported list includes the Xbox and Xbox 360 games that were playable via emulation on the Xbox One.

The original Xbox runs a custom operating system which is based on a heavily modified version of Windows 2000, an approach that Microsoft engineer Don Box called "fork and run". It exports APIs similar to those found in Microsoft Windows, such as Direct3D. While Windows 2000 was built for multitasking of multiple applications including memory paging, the Xbox console was planned to only run one application at a time, and these features were removed for the Xbox software. When loading a game, the operating system would unload itself to give all of the console's resources to the game, and then when the player left the game, the operating system would load back up again.

Xbox Live support was not originally part of the system software as shipped in 2001, but added later in November 2002. While the Xbox was still being supported by Microsoft, the Xbox Dashboard was updated via Live several times to reduce cheating and add features.