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64-bit Support for Intel Itanium-Based Computers
32 gigabyte of random access memory support
A cluster is a group of independent computers, called nodes, that work together to run a common set of applications and provide high availability.
If one node on the cluster fails, the application can be failed over to the next node. 
For more information on cluster modes, see "Network Load Balancing clusters" or "Server clusters" feature descriptions in this tool. Server clusters up to eight nodes are available only in the Enterprise and Datacenter Editions of Windows Server 20003.
WSRM provides resource management and enables the allocation of resources, including processor and memory resources, among multiple processes based on business priorities. An administrator sets targets for hardware resources that running applications or users (typically in a Terminal Server environment) are allowed to consume. 
It also creates utilization accounting records for management, service level agreement (SLA) tracking, and enabling charge-backs.
32 gigabyte of random access memory support
8 way symmetric multiprocessing support.
The Windows Server 2003 family supports single or multiple central processing units (CPU) that conform to the symmetric multiprocessing (SMP) standard. 
Using SMP, the operating system can run threads on any available processor, which makes it possible for applications to use multiple processors when additional processing power is required to increase the capability of a system. New features include SMP locking performance, improved registry performance, and increased Terminal Server sessions. Designed for small organizations and departmental use, Windows Server 2003, Standard Edition supports new systems with up to 4-way symmetric multiprocessing. Active Directory is the directory service for Windows Server 2003, Standard; Enterprise; and Datacenter Editions. It stores information about objects on the network and makes this information easy for administrators and users to find and use. Active Directory service uses a structured data store as the basis for a logical, hierarchical organization of directory information. Internet Connection Firewall (ICF) provides Internet security in the form of a firewall. Designed for use in the home and small business, ICF provides protection on computers directly connected to the Internet. This feature is available for local area network (LAN) or dial-up networking, virtual private networking (VPN) and Point-to-Point Protocol over Ethernet (PPPoE) connections. It also prevents scanning of ports and resources (such as file and printer shares) from external sources. Using Certificate Services and certificate management tools, you can deploy your own public key infrastructure (PKI). With a PKI, you can implement standards-based technologies, such as smart card logon capabilities, client authentication through Secure Sockets Layer (SSL) and Transport Layer Security (TLS), secure e-mail, digital signatures, and secure connectivity using Internet Protocol Security (IPSec). Using Certificate Services, you can set up and manage certification authorities (CAs) that issue and revoke X.509 v3 certificates. This means that you do not have to depend on commercial client authentication services, although you can integrate commercial client authentication into your PKI if you choose. Terminal Server lets you deliver Windows-based applications or the Windows desktop itself, to virtually any computing device-including those that cannot run Windows. For example, a user can access a virtual Windows XP Professional desktop and x86-based Windows applications from hardware that cannot run the software locally. Terminal Server provides this capability for both Windows and non-Windows-based client devices. When a user runs an application on Terminal Server, all of the application execution takes place on the server and only keyboard, mouse and display information traverses the network. Note: Terminal Server mode is not included on computers running the Microsoft Windows Server 2003, Web Edition. Remote OS Installation uses Group Policy, Remote Installation Services, and Pre-Boot eXecution Environment (PXE) server hardware to re-image a server with a clean install of a Windows Server 2003-based environment. This feature can also be used to re-image Windows 2000 and Windows XP desktops. Remote OS Installation can establish a full initial working set image directly to the computer hardware. Services for Macintosh provides Macintosh users with access to files stored on a computer running Windows Server 2003. The file server is accessible over TCP/IP networks and over AppleTalk networks. Print services allow Macintosh clients to print to Windows NT or Windows 2000 based print shares via the AppleTalk protocol. In addition to the print server, there is a 300 dpi PostScript RIP engine that allows Macintosh-generated PostScript print jobs to be sent to non-PostScript printers, such as inkjet printers. System & Other Requirements Minimum CPU Speed: 133mhz Minimum RAM: 128 meg Recommended CPU Speed: 733 Recommended Minimum RAM: 32 GB and 64 GB for Itanium based processors Multi-Processor Support: up to 8 note Windows Server 2003 may not use multiple processors with some Intel Pentium Pro or Pentium II Processors. For more information, please review Microsoft TechNet Knowledge Base Article 319091. Disk Space for Setup: 1.5 gb for Intel x86 Processors, 2 gb for Itanium Bases Processors Remote OS Installation can establish a full initial working set image directly to the computer hardware.
Services for Macintosh provides Macintosh users with access to files stored on a computer running Windows Server 2003. 
The file server is accessible over TCP/IP networks and over AppleTalk networks. Print services allow Macintosh clients to print to Windows NT or Windows 2000 based print shares via the AppleTalk protocol.
In addition to the print server, there is a 300 dpi PostScript RIP engine that allows Macintosh-generated PostScript print jobs to be sent to non-PostScript printers, such as inkjet printers. 

System & Other Requirements Minimum CPU Speed: 133mhz
Minimum RAM: 128 meg
Recommended CPU Speed: 733
Recommended Minimum RAM: 32 GB and 64 GB for Itanium based processors
Multi-Processor Support: up to 8 note
Windows Server 2003 may not use multiple processors with some Intel Pentium Pro or Pentium II Processors. For more information, please review Microsoft TechNet Knowledge Base Article 319091.
Disk Space for Setup: 1.5 gb for Intel x86 Processors, 2 gb for Itanium Bases Processors