Does Windows SBS 2003 R2 include all the components of Windows Server 2003 R2?
No. The core Windows Server 2003 technologies are available in Windows SBS 2003 R2, but many of the enhancements in Windows Server 2003 R2 are designed for medium- to large-sized businesses. By the time most small businesses require those technologies, such as an enterprise-class branch office infrastructure management, their IT needs have exceeded the capabilities of Windows SBS 2003 R2. What is important to remember, however, is that key technologies from the Windows Server family have been added to Windows SBS 2003 R2, including Windows Software Update Services (WSUS) and SharePoint Services 2.0 SP2. Windows SBS 2003 R2 customers can easily receive those technology benefits without requiring a significant investment in their IT infrastructure.