What is Windows Server 2008 R2?

Compare features, editions and basic hardware requirements of Server 2008 Release 2 Windows Server 2008 R2

Microsoft Windows Server 2008 R2 (or ‘Release 2’) is Microsoft’s latest release of the Windows Server operating system. It boasts several new features as compared to the original release of Windows Server 2008, namely that it supports only 64-bit architecture.