Microsoft has officially launched the Windows Server Insider Program with build 16237, thus providing its customers with an early look at the next version of its server companys.
As with any program Windows Insider, users are allowed to try the upcoming ones functions before public release. So the future customers of the company can provide comments and suggestions to improve certain functions.
The changelog of the upcoming system is big enough and you should read it before you decide to try it. You will also be able to submit feedback from the Feedback Hub, but you must select the Server category.
You can download Windows Server from the Microsoft official page, which provides two different keys for unlimited Windows Server activation. These keys can only be used for preview editions and not for production systems:
Server & Hosting Datacenter Core: B69WH-PRNHK-BXVK3-P9XF7-XD84W
Standard Core Server: V6N4W-86M3X-J77X3-JF6XW-D9PRV
Download the Server (you need to log in to your account)
https://www.microsoft.com/en-us/software-download/windowsinsiderpreviewserver