The technologies of Longhorn are broken up into presentation ("Avalon"), data ("WinFS"), and communication ("Indigo") and are based on the Fundamentals pillar.

• Fundamentals
  Find out how the Fundamentals pillar provides a great experience to end-users and administrators in managing the Longhorn application life cycle.
  
  
• Avalon
  Avalon provides the foundation for building applications and high fidelity experiences in Longhorn, blending together application UI, documents, and media content, while exploiting the full power of your computer. The functionality extends to the support for Tablet and other forms of input, a more modern imaging and printing pipeline, accessibility and UI automation infrastructure, data driven UI and visualization, as well as the integration points for weaving the application experience into the Windows shell.
  
  
• Indigo
  Explore "Indigo," a set of .NET technologies for building and managing service-oriented systems.
  
  
• WinFS
  "WinFS" is the code name for the next generation storage platform in Windows "Longhorn." Taking advantage of database technologies, Microsoft is advancing the file system into an integrated store for file data, relational data, and XML data. Windows users will have intuitive new ways to find, relate, and act on their information, regardless of what application creates the data. Also, "WinFS" will have built-in support for multi-master data synchronization across other Longhorn machines and other data sources. The platform supports rich managed Longhorn APIs as well as Win32 APIs.