Microsoft Windows Server 2008 R2 is the next version of the Windows Server operating system from Microsoft. Building on the features and capabilities of the current Windows Server 2008 release version, Windows Server 2008 R2 allows you to create solutions that are easier to plan, deploy, and manage than previous versions of Windows Server.

The Windows Server 2008 R2 Beta is available for free download via Microsoft Download Center,

Direct link:

Windows Server 2008 R2 Beta Standard, Enterprise and DataCenter Edition (English) (2850.0MB)

7000.0.081212-1400_server_en-us-GB1SXFRE_EN_DVD.iso

Windows Server 2008 R2 Beta Web Edition (English) (2724.3MB)

7000.0.081212-1400_serverweb_en-us-GB1WXFRE_EN_DVD.iso

Windows Server 2008 R2 Beta for Itanium Based Systems (English) (2512.2MB)

7000.0.081212-1400_serverenterpriseia64_en-us-GB1SIAIFRE_EN_DVD.iso

Windows Server 2008 R2 Beta Product Keys for Evaluation:

Windows Server 2008 R2 Beta Enterprise :  TFGPQ-J9267-T3R9G-99P7B-HXG47
Windows Server 2008 R2 Beta Standard : 2T88R-MBH2C-M7V97-9HVDW-VXTGF
Windows Server 2008 R2 Beta Datacenter : GQJJW-4RPC9-VGW22-6VTKV-7MCC6
Windows Server 2008 R2 Beta (Itanium Systems) : CQ936-9K2T8-6GPRX-3JR9T-JF4CJ
Windows Web Server 2008 R2 Beta : GT8BY-FRKHB-7PB8W-GQ7YF-3DXJ6