Windows Server 2008 R2 spanning both server and desktop virtualization with flexible solutions contains Microsoft's most powerful virtualization portfolio ever. But no single solution is right for everyone, Citrix released a new version of Citrix Essentials 5.5 that supports all latest features available in Windows Server 2008 R2, Hyper-V in R2 and System Center. Citrix's StorageLink Site Recovery can utilize Hyper-V in R2 and new features in Microsoft Clustering to ease disaster recovery testing and staging and has a lighter management burden using Windows Server 2008 R2's new management capabilties as well as features like Live Migration.