OEM EDITIONS ARE BOUND TO YOUR MOTHERBOARD (PC). IN CASE OF MOTHERBOARD REPLACEMENT, YOU CAN CALL MICROSOFT SUPPORT TO HAVE YOUR OEM KEY TRANSFERED TO YOUR NEW MOTHERBOARD (PC).
Global key for PC.

Windows Server Essentials is an integrated server suite from Microsoft designed for running network infrastructure (both intranet management and Internet access) of small and midsize businesses having no more than 25 users or 50 devices.Essentials is a good option for customers currently using the Foundation edition.

Application server technologies are tightly integrated to provide and offer management benefits such as integrated setup, enhanced monitoring, Remote Web Workplace, a unified management console, and remote access.

Windows Server Essentials Experience is a role in Windows Server 2016 that enables you to take advantage of all the features (such as Remote Web Access and PC backup) that are available to you in Windows Server Essentials without the locks and limits that are enforced in Windows Server Essentials.