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Both Server 2012 R2 and PowerShell V4 introduced many new features and added enhancements to existing features. This included the Hyper-V, SmbShare, and BranchCache features, all of which were improved. These features came with PowerShell modules that enable you to leverage these features using PowerShell. Get more information on the modules that support the 2012 R2 features at https://technet.microsoft.com/en-us/library/dn249523.aspx.