Windows Servers
Buy a genuine Windows Server license for Windows Server 2025 or 2022 in Standard or Datacenter edition, including 16-core packs and Remote Desktop Services 50 User CAL packs. Every product in this family is a perpetual, one-time purchase with the license type stated on the product page, and your key is delivered by email within minutes of payment.
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Showing all 10 results
Windows Server license: every edition and CAL pack in one place
This is the parent category for every Windows Server license we sell at Software in Store. It covers the two current releases, Windows Server 2025 and Windows Server 2022, in Standard and Datacenter editions, in both base and 16-core license forms, plus the Remote Desktop Services 50 User CAL packs that license people to sign in over Remote Desktop.
Every Windows Server license here is genuine, activates against Microsoft's servers, and is a perpetual license: one payment, no subscription, no annual true-up. Delivery is digital, by email within minutes of payment, 7 days a week. The email contains the 25-character key, the official Microsoft download link for the installation media and a short installation guide, and the key is also stored under My Account. We are an independent reseller, not affiliated with Microsoft, and the license type is stated on every product page.
The two releases in this family
Use the child categories to compare products within one release. Each child page explains the edition differences, the per-core rules and the RDS CAL requirement for that version.
- Windows Server 2025: the current Long-Term Servicing Channel release. Standard, Standard 16-Core, Datacenter, Datacenter 16-Core and the 2025 RDS 50 User CAL pack. The default for new deployments and the longest remaining support window.
- Windows Server 2022: the previous release, still widely deployed and fully supported, with mainstream support scheduled to end October 13, 2026 and extended support running to October 14, 2031. Standard, Standard 16-Core, Datacenter, Datacenter 16-Core and the 2022 RDS 50 User CAL pack.
How Windows Server licensing works
Windows Server Standard and Datacenter are licensed per physical core. Every physical core in the server must be licensed, with a minimum of 16 cores per server. A server with a single 8-core processor still needs 16 core licenses; a server with two 16-core processors needs 32. Our 16-Core products cover that minimum in one purchase, and additional core licenses bring a larger server up to its full count. The edition you choose then determines virtualization rights: a Standard license covers two operating system environments, meaning the Hyper-V host role plus two virtual machines, while Datacenter covers unlimited virtual machines on the licensed host.
The server license alone does not permit anyone to use the server. Every user or device that accesses Windows Server needs a Client Access License, and any user who connects through Remote Desktop Services needs an RDS CAL in addition to the base CAL. The RDS 50 User CAL packs in this family license fifty named users each for Remote Desktop on the matching server version. User CALs are usually the right choice because staff connect from more than one device.
Windows Server 2025 Standard vs Datacenter
The edition question is a counting exercise, and it works the same way for 2022. The two editions share the same code, roles, features and hardware support. Datacenter adds unlimited virtualization and a small group of software-defined datacenter features.
| Edition | Virtual machines per license | Software-defined features | Licensing | Typical fit |
|---|---|---|---|---|
| Windows Server Standard (2025 or 2022) | 2 OSEs or Hyper-V containers, plus the Hyper-V host role | Storage Replica limited; no Storage Spaces Direct, software-defined networking or shielded VMs | Per core, 16-core minimum, CALs required | Physical servers, branch offices, hosts with up to 2 VMs |
| Windows Server Datacenter (2025 or 2022) | Unlimited OSEs and Hyper-V containers on the licensed host | Storage Spaces Direct, software-defined networking, shielded VMs, unlimited Storage Replica | Per core, 16-core minimum, CALs required | Dense virtualization hosts, clusters, private cloud |
| RDS 50 User CALs (2025 or 2022) | Not applicable | Not applicable | Per user, in addition to base CALs | Remote Desktop session hosts, RemoteApp servers |
With two or fewer virtual machines on a host, Standard is the cost-effective license. You can stack Standard licenses to add two VMs at a time, and the crossover where Datacenter becomes the simpler purchase usually falls somewhere around ten to fourteen VMs on one host. Above that, or as soon as you want Storage Spaces Direct or software-defined networking, Datacenter is the answer.
Windows Server 2022 or 2025?
Both releases are supported and both are in stock. Windows Server 2025 is the newer release, with Active Directory improvements, SMB over QUIC in Standard and Datacenter, NVMe storage performance gains and a longer remaining lifecycle, so it is the default for a new server. Windows Server 2022 remains the right choice when an application vendor has not yet certified 2025, when you are adding a node to an existing 2022 cluster, or when older hardware does not meet the 2025 processor requirements. RDS CALs must match or exceed the server version: 2025 RDS CALs work with 2025 and 2022 session hosts, while 2022 RDS CALs work with 2022 hosts.
Which Windows Server license should I choose?
- Windows Server 2025 Standard 16-Core: the right starting point for a single physical server or a small Hyper-V host with up to two virtual machines on the current release.
- Windows Server 2025 Datacenter: for a virtualization host that will run many VMs, or for Storage Spaces Direct and software-defined networking. The product page states the core coverage.
- Windows Server 2022 Standard 16-Core: the 16-core minimum on the previous release, for adding to an existing 2022 environment or for applications certified only on 2022.
- Windows Server 2025 RDS 50 User CALs: licenses fifty users to connect through Remote Desktop Services, required in addition to the server license and base CALs.
- Windows Server 2022 RDS 50 User CALs: the matching pack for Remote Desktop users on a 2022 session host.
Unsure about core counts or CALs? Email us the server model, processor count, planned VM count and user count, and we will confirm the license set before you order.
How activation and delivery work
- Choose the release, edition and core pack, add any RDS CAL pack you need, and pay by card, Apple Pay or Google Pay through our encrypted, PCI-compliant checkout. We never see your card number.
- Within minutes of payment, 7 days a week, we email the 25-character product key, the official Microsoft download link and a short installation guide. The key is stored under My Account as well.
- Download the ISO from Microsoft, create installation media or mount it in your hypervisor, install Windows Server and enter the key when prompted, or apply it afterwards from an administrator command prompt with slmgr. Activate over the internet.
- If the server sits on an isolated network and Microsoft requests phone activation, send us the Installation ID and our team returns the Confirmation ID. RDS CALs are installed on the Remote Desktop licensing server through RD Licensing Manager using the license pack from your delivery email.
Every key is covered by our 30-day money-back guarantee. If a key cannot be activated and our support team cannot resolve the problem, we replace the key or refund the order in full.
Retail, OEM or volume: read the product page
Windows Server licenses reach the market as retail, OEM and volume keys, and the product page states which one you are buying. A retail license can be reassigned to a replacement server in line with Microsoft's terms. An OEM license is tied to the server it was first activated on. A volume (MAK) key is intended for organizations, allows a limited number of activations, and suits a business licensing several servers at once. All three are perpetual licenses that activate against Microsoft's servers.
Frequently asked questions
Do I need CALs on top of the Windows Server license?
Yes. The server license covers the operating system on the hardware; it does not grant anyone the right to use it. Every user or device that accesses the server, whether for files, printing, authentication or applications, needs a Windows Server CAL. Users who sign in through Remote Desktop Services need an RDS CAL in addition to the base CAL. The RDS 50 User CAL packs in this category cover the Remote Desktop requirement for fifty named users. Base CALs are a separate purchase, and our team can advise on the count you need.
What is the difference between Windows Server Standard and Datacenter?
Both editions run the same code and offer the same roles and features. Standard licenses two operating system environments, meaning the Hyper-V host plus two virtual machines, per license, and you can stack licenses to add two VMs at a time. Datacenter licenses unlimited virtual machines on the licensed host and adds Storage Spaces Direct, software-defined networking and shielded virtual machines. The practical rule is to count VMs: two or fewer means Standard, a dense virtualization host means Datacenter, and the crossover usually sits around a dozen VMs.
How many core licenses does my server need?
License every physical core in the server, with a minimum of 16 cores per server. A single 8-core processor still requires 16 core licenses. Two 12-core processors require 24. Two 16-core processors require 32. Our 16-Core products cover the minimum in one purchase, and additional core licenses top up larger servers. Virtual machines are licensed through the host: a Standard license permits two VMs on a fully licensed host, Datacenter permits unlimited. If you send us the processor model and count, we will confirm the exact number.
Should I buy Windows Server 2025 or 2022?
For a new server on current hardware, choose Windows Server 2025. It is the newest release, has the longest remaining support window, and adds Active Directory, SMB and storage improvements. Choose Windows Server 2022 when a line-of-business application is certified only on 2022, when you are joining an existing 2022 cluster or domain that has not been upgraded, or when the hardware does not meet the 2025 processor requirements. Both are perpetual licenses, both are in stock, and both use the same per-core and CAL model.
Is a Windows Server license a one-time purchase?
Yes. Every Windows Server license we sell is perpetual. You pay once for the edition and core count, activate the server, and it keeps running with no annual renewal or subscription. Microsoft's Long-Term Servicing Channel releases receive ten years of updates, five mainstream and five extended, so Windows Server 2022 is covered to October 2031 and Windows Server 2025 further still. The same applies to RDS CAL packs: they are a one-time purchase for the number of users stated.
Windows Server usually runs alongside a database and a fleet of client PCs. Our SQL Server category has SQL Server 2022 Standard and Enterprise licenses that pair with either release, and the Operating Systems category covers Windows 11 Pro and Enterprise for the workstations that will connect. For a step-by-step view of ordering, delivery and activation, read how it works.