Both Windows Server 2012/R2 and Windows 8.1 can perform some server functions and some desktop functions, but important differences distinguish them. Windows 8.1 is configured to emphasize the user interface and is performance-tuned to run desktop applications. Windows Server 2012/R2, on the other hand, deemphasizes many of Windows 8.1’s user interface bells and whistles in favor of a less flashy and less resource-intensive user interface. In addition, Windows vServer 2012/R2 is performance-tuned to run background processes so that client computers can access network services faster. Speaking of network services, most Windows Server 2012/R2 editions can run the following network services, among others:
