Global key for PC.

Steps to convert the evaluation version to the official version：
1. Start ———— Run ———— CMD (Administrator Mode); Enter DISM / online / Get-CurrentEdition and see what your Edition ID is
As shown above: The evaluation version of the Standard Edition is generally ServerStandardEval. The four-letter Eval is your Edition ID.For example, mine is ServerStandard.
2. Find a standard product key
cmd input: DISM / online / Set-Edition: ServerStandard / ProductKey: yourkey / AcceptEula
After restarting as shown above, activate it.

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 2019 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.