User profile, authentication and sign-in, privileges, and privacy settings.
Friends list (People system), official and in-game clubs, activity feed (presence strings), and reputation.
Achievements, player stats, leaderboards, and featured stats.
Connected Storage and Title Storage.
Matchmaking, invites, voice and text chat, and networking.
Web services, relying parties, single sign-on, and access policies.
Services that span multiple features
What's new for Xbox Live
New features and functionality in each release of Xbox Live.
Title-callable UI (TCUI)
Enables your game code to call pre-defined user interface displays.
Real-Time Activity (RTA) service
Enables an application on any device to subscribe to state data, user statistics, and presence.