If you run Windows virtual machines on your own hosts, the edition of Windows Server you license decides how many Windows VMs you may run. This guide explains Windows Server Standard vs Datacenter for virtualization at a practical level. Licensing rules change between versions and programmes, so always confirm with Microsoft's current licensing documentation or a licensing partner.
Before you start
- Know the physical host's CPU core count and how many Windows VMs you plan to run.
- On a rented Windows VPS, the provider normally handles the Windows licence for that VM; this guide is mainly for people running their own hosts.
Core-based licensing basics
- Current Windows Server versions are licensed per physical core on the host, with minimum core counts per processor and per server.
- Client Access Licences (CALs) are generally needed for users or devices accessing the server, plus RDS CALs for remote desktop workloads; see RDS licensing.
Virtualization rights
| Standard | Datacenter | |
|---|---|---|
| Windows VMs (OSEs) per fully licensed host | Two; license all cores again for each additional two | Unlimited |
| Best for | Lightly virtualized hosts | Dense virtualization hosts |
| Cost | Lower per licence set | Higher, but cheaper at many VMs |
These rights apply regardless of the hypervisor (Hyper-V, KVM, VMware), because they license the Windows guests running on that hardware.
Feature differences
- Datacenter adds features such as Storage Spaces Direct, Shielded VMs and software-defined networking, and on recent versions some Azure-related features.
- Core Windows Server roles (IIS, AD, file server, Hyper-V) are available in both.
How to choose
- One or two Windows VMs on a host: Standard is usually cheaper.
- Many Windows VMs, or VMs moving between hosts in a cluster: Datacenter often wins, because each host needs licences covering the VMs it may run.
- Do the arithmetic with your core count and VM count, including growth.
Related practicalities
- Activation: use the method that matches your licence (retail, volume, provider-supplied).
- Hosting providers selling Windows VPSs to third parties typically use Microsoft's service provider programme rather than ordinary retail licences.
Frequently asked questions
Can I run unlimited Linux VMs on a Standard host?
Windows licensing covers Windows instances. Linux guests are licensed by their own terms (usually free).
Does the Hyper-V host itself count as a VM?
If the physical OS is used only to host and manage VMs, it is generally not counted as one of the two Standard VMs. Check current terms.
Is this legal advice?
No. Licensing is complex; confirm with Microsoft or a licensing specialist.