Windows Server 2003 R2 Enterprise SP2 is an update to the Windows Server 2003 R2 operating system, which was initially released in December 2005. R2 stands for "Release 2," indicating that this was a major update to the operating system. Service Pack 2 (SP2) was released later, which provided additional bug fixes, security patches, and feature enhancements.
: Includes Active Directory Federation Services (ADFS) and improved storage management for branch offices. Hardware Requirements windows server 2003 r2 enterprise sp2 -32 64 bit- iso