Which Windows Server Version Should You Buy?
| Version | Security updates until | Editions available | Best for |
|---|
| Windows Server 2025 | November 2034 | Standard, Datacenter | New deployments; longest support |
| Windows Server 2022 | October 14, 2031 | Standard, Datacenter | Proven platform with long support |
| Windows Server 2019 | January 9, 2029 | Standard, Datacenter, Essentials | Existing 2019 estates, small businesses |
| Windows Server 2016 | January 12, 2027 | Standard, Datacenter, Essentials | Legacy apps, labs, lowest price |
For a new server, choose Windows Server 2025 or 2022. Older versions cost less and are useful for matching existing infrastructure, training labs and legacy applications.
Windows Server Standard vs Datacenter vs Essentials
| Standard | Datacenter |
|---|
| Licensing | Per core, 16-core minimum per server | Per core, 16-core minimum per server |
| Virtual machines (OSEs) | 2 per fully licensed server | Unlimited |
| Hyper-V | Yes | Yes |
| Storage Spaces Direct, software-defined networking | No | Yes |
| Best for | Physical or lightly virtualised servers | Heavily virtualised hosts and clusters |
Essentials (2019 and 2016) is designed for small businesses with up to 25 users and 50 devices on a single server, and does not need CALs. Microsoft does not offer a retail Essentials edition for Server 2022 or 2025.
How Windows Server Licensing Works
Standard and Datacenter are licensed per physical core. Every server must license at least 16 cores (and at least 8 per processor). Our Standard and Datacenter keys cover a standard 16-core server; larger servers need additional core licences. Standard includes rights to run two virtual machines on the licensed host; Datacenter allows unlimited VMs, which makes it cheaper per VM once you run more than a handful.
Do You Need CALs?
Windows Server Standard and Datacenter require a Client Access Licence (CAL) for each user or device that connects to the server. Remote Desktop Services needs separate RDS CALs on top of that, beyond the two administrative sessions included with every server. Choose RDS User CALs when people connect from several devices, or RDS Device CALs for shared PCs. Our RDS CAL activation guide explains installation.
How to Install and Activate Windows Server
- Download the ISO for your version from Microsoft and install the Standard or Datacenter edition (Desktop Experience if you want the full GUI).
- Open Settings → System → Activation, or run
slmgr /ipk YOUR-KEY then slmgr /ato in an elevated Command Prompt. - Activation completes online.
Detailed walkthroughs: Windows Server 2022 Standard and Windows Server 2022 Datacenter.
Why Buy From Microsoft Software Swap?
- Genuine licences that activate online through the publisher's own servers.
- Instant email delivery of your key, download link and invoice, usually within minutes.
- 30-day money-back guarantee if the licence doesn't work for you.
- Lifetime replacement warranty: if an activated key ever stops working, we replace it free.
- 24/7 email support for installation and activation, plus step-by-step installation guides.
Windows Server Licence FAQ
What is the difference between Windows Server Standard and Datacenter?
Both have the same core features. Standard includes two virtual machines per licensed server; Datacenter includes unlimited VMs plus Storage Spaces Direct and software-defined networking.
How much does a Windows Server licence cost?
Our prices are listed on each product. Microsoft licenses Standard and Datacenter per core with a 16-core minimum per server, and our keys cover a 16-core server.
Can I use Windows Server for a homelab?
Yes. A Standard key is a cost-effective way to run Active Directory, Hyper-V and file services at home.
Do I need CALs?
Yes for Standard and Datacenter: each user or device needs a CAL, and Remote Desktop users also need RDS CALs. Essentials editions include access for up to 25 users.
Can I convert an evaluation copy to a full licence?
Yes. Use DISM /online /Set-Edition with your key to convert an evaluation installation to the licensed edition.
Which version has the longest support?
Windows Server 2025, with security updates until November 2034.
Useful Links
