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Microsoft announced on October 18th that the final release of Windows Server 2012 R2, Hyper-V 2012 R2 and System Center 2012 R2 are now generally available.

Windows Server 2012 R2 delivers significant value around seven key capabilities:

• Server virtualization. Whether you are looking to expand virtual machine mobility, increase virtual machine availability, handle multi-tenant environments, gain bigger scale, or gain more flexibility, Windows Server 2012 R2 with Hyper-V gives you the platform and tools you need to increase business agility with confidence. Plus, you can also benefit from workload portability as you extend your on-premises datacenter into a service provider cloud or Windows Azure.
• Storage.Microsoft designed Windows Server 2012 R2 with a strong focus on storage capabilities, including improvements in the provisioning, accessing, and managing of storage and the transfer of data across the network that resides on that storage. The end result is a storage solution that delivers the efficiency, performance, resiliency, availability, and versatility you need at every level.
• Networking.Windows Server 2012 R2 makes it as straightforward to manage an entire network as a single server, giving you the reliability and scalability of multiple servers at a lower cost. Automatic rerouting around storage, server, and network failures enables file services to remain online with minimal noticeable downtime. In addition, Windows Server 2012 R2 provides the foundation for software-defined networking, out-of-the box, enabling seamless connectivity across public, private, and hybrid cloud implementations.
• Server management and automation. Datacenter infrastructure has become more and more complex. Multiple industry standards are confusing hardware vendors. Customers are looking for guidance on how to best automate their datacenter while adopting a standards-based management approach supporting their multi-vendor investments. Windows Server 2012 R2 enables IT professionals to offer an integrated platform to automate and manage the increasing datacenter ecosystem. Features within Windows Server 2012 R2 enable you to manage many servers and the devices connecting them, whether they are physical or virtual, on-premises or in the cloud.
• Web and application platform. Even greater application flexibility, helping you build and deploy applications either on-premises, in the cloud, or both at once, with hybrid solutions that can work in both environments. Windows Server 2012 R2 provides the tools you need to build, provision, and manage multi-tenant environments while still supporting your large enterprise or the many customers hosted within your service provider infrastructure.
• Access and information protection. Users need to be able to access this information from anywhere, share it where appropriate, and achieve maximum productivity with the assets they have. Windows Server 2012 R2 helps you accommodate these changes through exciting new remote access options, significant improvements to Active Directory and Active Directory Federation Services, and the introduction of policy-based information access and audits with Dynamic Access Control, and new scenarios to help customers provide access to corporate resources for users from their own devices. With these new capabilities, you can better manage and protect data access, simplify deployment and management of your identity infrastructure, and provide more secure access to data from virtually anywhere across both on-premises well managed devices and new consumer orientated form factors.
• Virtual Desktop Infrastructure. VDI technologies in Windows Server 2012 R2 offer easy access to a rich, full-fidelity Windows environment running in the datacenter, from virtually any device. Through Hyper-V and Remote Desktop Services (RDS), Microsoft offers three flexible VDI deployment options in a single solution: Pooled Desktops, Personal Desktops, and Remote Desktop Sessions (formerly Terminal Services). With Windows Server 2012 R2, you get a complete VDI toolset for delivering flexible access to data and applications from virtually anywhere on popular devices, while also helping to maintain security and compliance.

• Download an evaluation of Windows Server 2012 R2

You can find more info here: http://blogs.technet.com/b/windowsserver/archive/2013/10/18/announcing-the-general-availability-of-windows-server-2012-r2-the-heart-of-cloud-os.aspx