Windows Server 2003. Microsoft Servers, Windows Server 2008, Windows 2000, Features new to Windows XP, Internet Information Services, Microsoft Message Queuing, Directory service, X. 509, Lightweight Directory Access Protocol, Windows Small Business Server, Windows SharePoint Services, Microsoft SQL Server, Microsoft Internet Security and Acceleration Server, Client Access License, Active Directory, 64- bit, X86- 64, Non- Uniform Memory Access, Microsoft Cluster Server, Application programming interface, Distributed File System (Microsoft), Storage area network, ISCSI, Standard RAID levels, Windows Home Server, Data Execution Prevention, Microsoft Management Console, IEEE 802. 11i- 2004, IPsec, Comparison of operating systems