Why is Server 2025 being tested so far ahead of its release? Is it because its going to be the first one carrying the Windows 11 UI?
Is this server-Windows Server Vnext LTSC Preview- can you update by Wu? Do you have to belong to an Insider channel?
No, Server 2022 is already out (20348.x). The 22xxx builds are Dev builds that will become the next server (most probably Server 2025).
Is it possible to upgrade to newer server builds from Windows Update? Or do I have to download a newer ISO and upgrade from that?