In fact, the evaluation version of Windows Server 2008 R2 RTM has been released ahead of schedule.
Windows Server 2008 R2 builds on the foundation of Windows Server 2008 to expand existing technology and add new features to enable organizations to increase the reliability and flexibility of their server infrastructures. Microsoft is now officially releasing the ISO image for Windows Server 2008 R2 Trial Software, which allowing administrators and users to install Windows Server 2008 R2 to evaluate the new operating system for 180 days for free.
Windows Server 2008 R2 is the next iteration of Windows Server operating system, which has been RTMed with build version.