Feature是Longhorn里面最新提供的特性，这不仅让我们想起了WSS 3.0和MOSS2007里面的feature。Longhorn beta3的"Server Manager"里面一共提供了35个feature以及每个feature下属的更小的feature：

• .NET Framework 3.0

  • .NET Framework 3.0 Features
  • XPS Viewer

  • Windows Communication Foundation Activation Components

    • HTTP Activation
    • Non-HTTP Activation
• BitLocker Drive Encryption
• BITS Server Extensions
• Connection Manager Administration Kit
• Desktop Experience
• Failover Clustering
• Group Policy Management
• Internet Print Client
• Internet Storage Name Server
• LPR Port Monitor

• Message Queuing

  • Message Queuing Services

    • Message Queuing Server
    • Directory Service Integration
    • Message Queuing Triggers
    • HTTP Support
    • Multicasting Support
    • Routing Service
  • Windows 2000 Client Support
  • Message Queuing DCOM Proxy
• Multipath I/O
• Network Load Balancing
• Peer Name Resolution Protocol
• Quality Windows Audio Video Experience
• Remote Assistance

• Remote Server Administration Tools

  • Role Administration Tools

    • Active Directory Certificate Services
    • Active Directory Domain Services
    • Active Directory Lightweight Directory Services
    • Active Directory Rights Management Services
    • DNS Server
    • FAX Server

    • File Services

      • DFS Management Console
      • File Server Resource Manager Management Console
      • Service for Network File System

    • Network Policy and Access Services

      • Network Policy Server
      • Health Registration Authority
    • Print Services

    • Terminal Services

      • TS RemoteApp Manager
      • TS Gateway Manager
      • TS Licensing Manager
    • Web Server
    • Windows Deployment Service

  • Feature Administration Tools

    • BitLocker Driver Encryption
    • BITS Server Extentions
    • Failover Clustering
    • Network Load Balancing
    • SMTP Server
    • Windows System Resource Manager
• Remove Storage Manager
• RPC over HTTP Proxy
• Simple TCP/IP Service
• SMTP Server

• SNMP Services

  • SNMP Service
  • SNMP WMI Provider
• Storage Manager for SANs
• Subsystem for UNIX-based Applications
• Telnet Client
• Telnet Server
• TFPT Client
• Windows Internal Database
• Windows PowerShell

• Windows Process Activation Service

  • Process Model
  • .NET Environment
  • Configuration APIs
• Windows Recovery Disc
• Windows Server Backup
• Windows System Resource Manager
• WINS Server
• Wireless Networking

可以看出，feature是对原来"Windows组件"的替代（Longhorn beta3已经没有了"添加/删除程序"，以"Programs and Features"代替）。