Azure Stack HCI

Azure Stack HCI is a series of Windows Server-based operating systems, initially released in December 2020 after being announced on 21 July 2020. It is a modified version of the Windows Server core edition intended for hyperconverged infrastructure integration with the Microsoft Azure cloud service.

Servicing model
Azure Stack HCI uses an update model similar to Windows as a service, where Microsoft would release small updates to the operating system after a yearly development cycle. Updates are delivered to the operating system on a monthly cadence.