Windows Server 2025 is the cloud-ready operating system that supports your current workloads while introducing new technologies that make it easy to transition to cloud computing when you are ready. It delivers powerful new layers of security along with Azure-inspired innovation for the applications and infrastructure that power your business. Windows Server 2025 Datacenter is for highly virtualized datacenter and cloud environments.  Each purchase includes 2 core licenses.  A minimum of 16 core licenses (eight 2-core packs) is required per server. If your server has more than 16 cores, you will need to buy additional licenses (see Windows Server licensing page for details.) You also need to purchase Windows Server Client Access Licenses (CALs) for every user or device accessing the server.