Windows Server 2019 Datacenter

What is included in Windows Server 2019 Datacenter?

Unlimited Virtualization – Run unlimited Windows VMs per licensed host
Storage Spaces Direct – Pool local disks into clustered software-defined storage
Shielded VMs – Encrypt and lock guest VMs against compromised hosts
Software-Defined Networking – Manage network policy without dedicated hardware appliances
Storage Replica – Unlimited volume replication for disaster recovery failover
Core Capacity – Per-core model, 16-core minimum, CALs sold separately

What are the main benefits of Windows Server 2019 Datacenter?

Windows Server 2019 Datacenter is Microsoft's top 2019 server edition, built for heavily virtualized data centers and private-cloud hosts. It bundles every Datacenter-only feature: unlimited VMs, Storage Spaces Direct, Shielded VMs, and Software-Defined Networking.

VM Density – License cores once, run unlimited guests
Hyper-Converged Storage – Build resilient clusters without a separate SAN
Workload Isolation – Shielded VMs protect tenant data from admins
Hybrid Ready – Connects on-premises hosts to Azure services
Inherited Activation – Activate Standard guests automatically on this host
Long Support – Extended Microsoft support runs through January 2029

What does Windows Server 2019 Datacenter do?

It runs server workloads and an unlimited number of Hyper-V virtual machines on one licensed physical host, which is the core reason to choose Datacenter over Standard. On Standard you may run only two VMs per fully licensed server, then must re-license all cores for each additional pair, so dense virtualization quickly becomes cheaper on Datacenter. The edition also adds Storage Spaces Direct and Storage Replica, letting you build clustered storage from local disks instead of buying a SAN. For a host packing many VMs onto a few physical servers, this combination removes both the per-VM licensing math and the external storage cost.

User CAL or Device CAL: What You Really Need
Explains when a User CAL or Device CAL is the more cost-effective choice when upgrading to the Standard edition.

End of Support for Windows Server 2022: Windows Server 2025 vs. 2022 vs. 2019: Is It Worth Upgrading?
Compares the 2019, 2022, and 2025 releases to help determine whether upgrading to the latest version is worthwhile.

How does Datacenter differ from Windows Server 2019 Standard?

The two editions share the same code base and roles, but Datacenter removes the virtualization cap and unlocks the software-defined features Standard locks out. Standard is limited to two operating system environments per fully licensed server and cannot run Storage Spaces Direct, Shielded VMs, or full Software-Defined Networking. Standard's Storage Replica is also capped at one partnership and a single 2 TB volume, while Datacenter allows unlimited replicas. Choose Datacenter when VM count is high or you need clustered local storage; choose Standard for a few fixed VMs where those features are unnecessary.

Does Windows Server 2019 Datacenter include CALs?

No. The Datacenter license covers the server operating system and its cores, but each user or device that accesses the server still needs a separate Windows Server CAL. A User CAL lets one named person connect from any number of devices, while a Device CAL lets any number of users share one device, so shift-based workers usually cost less with Device CALs. Remote Desktop sessions need a second, separate RDS CAL on top of the Windows Server CAL. Plan the CAL count before deployment, because the server runs but blocks unlicensed client access once configured for it.

Can Windows Server 2019 Datacenter host Remote Desktop Services sessions?

Yes, the RDS role is built in, but it needs RDS CALs and an RD Licensing server to keep working past the 120-day grace period. RDS CALs are not edition-specific, so the same CAL works on Standard or Datacenter; what matters is version, since a 2019 session host requires a 2019-or-newer RDS CAL and will reject older 2016 CALs. After the grace window expires without valid CALs installed, remote sign-ins fail. Buy the RDS CALs separately and match or exceed the server version to avoid that lockout.

What limitations should buyers know before choosing this edition?

The main constraint is licensing math rather than features: you must license every physical core, with a minimum of 8 cores per processor and 16 cores per server, even on smaller hardware. Datacenter only pays off over Standard once you run many VMs or need Storage Spaces Direct, Shielded VMs, or full SDN, since those are the features Standard lacks. Mainstream support for Windows Server 2019 has ended, and extended support runs until January 2029, so it suits workloads not yet ready for Server 2022 or 2025. Confirm your core count and CAL needs first, because both add cost on top of the base license.

What is the difference between a User CAL and a Device CAL?

A User CAL is tied to a person and lets that one user reach the server from any number of devices, while a Device CAL is tied to hardware and lets any number of users connect from that single device. User CALs fit staff who use a laptop, phone, and desktop, since one CAL covers all three. Device CALs fit shared machines such as a shift-worked terminal or a shop-floor PC used by many people. Count whichever number is lower for your environment, because mixing both types is allowed and usually cheaper.

Frequently asked questions about Windows Server 2019 Datacenter

Is the Datacenter VM count really unlimited?

Yes. Once every physical core on the host is licensed, Datacenter grants rights to run an unlimited number of Windows operating system environments on that server. This is the single biggest difference from Standard, which caps you at two VMs before you must re-license all cores again.

Can a Standard VM be activated by a Datacenter host?

Yes. Windows Server 2019 supports Automatic Virtual Machine Activation, so Standard or Datacenter guests inherit activation from a licensed Datacenter host without separate keys per VM. This simplifies activation across large VM fleets running on the same physical server.

Can older RDS CALs connect to a 2019 server?

No. RDS CALs are backward-compatible but not forward-compatible, so a 2016 RDS CAL cannot license a 2019 session host. You need a 2019-or-newer RDS CAL, and your RD Licensing server must run a version equal to or newer than the CAL.

Legal Information About Our Products

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Below you will find the most important legal information about our products.

Unused and Non-Activated Product Keys

We offer exclusively unused and non-activated product keys. The keys have never been redeemed for activation and are fully available to the purchaser for the first-time activation of the respective product. A key that has already been redeemed could no longer be used for a new activation and is therefore not offered by us.

Trading in these product keys is permissible in the European Union and in Switzerland under current case law, provided that the necessary conditions are met. These conditions are as follows:

• The software must originally have been placed on the market with the consent of the rightholder within the territory of the EU, another contracting state of the EEA, or Switzerland by way of sale.
• The license for the software must have been granted in return for the payment of a fee intended to enable the rightholder to obtain remuneration corresponding to the economic value of the copy of the software.
• The rightholder must have granted the first acquirer the right to use the software permanently (for an unlimited period).
• Any improvements and updates that the subsequently downloaded computer program has compared to the originally downloaded one must be covered by a maintenance agreement concluded between the rightholder and the first acquirer.
• The original licensee must have made their own copies unusable.

This trade is legally permissible because the underlying license was already placed on the market with the consent of the rightholder within the EU/EEA or Switzerland in return for appropriate remuneration. As a result, the so-called principle of exhaustion has taken effect, which permits the resale of individual product keys — in particular those originating from volume license agreements. Microsoft or the respective software provider has already received appropriate remuneration for this.

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Important note: The acquisition of a product key through the transmission of a combination of numbers and letters in digital form does not, in itself, constitute a license for the lawful use of the program. The license only arises from the respective installation and the associated acceptance of the manufacturer's terms of use.

Further information can be found here:

• Legal assessment by Swiss lawyers

Overview of the Most Important Legal Information

• We offer unused, non-activated product keys for the activation of the respective computer programs. The key alone is not yet a license.
• The license only arises from the respective installation and the resulting acceptance of the terms of use. These terms of use govern the right to use the software between you and the respective manufacturer.
• The principle of exhaustion has, as a rule, taken effect — i.e. the license is "used up" — as soon as it was lawfully placed on the market for the first time. The products concerned are software placed on the market for unlimited-time use in the form of an activatable product key with the option to download the program. Microsoft or the respective software provider has received appropriate remuneration for this.
• You gain access to particularly attractively priced product keys from volume license agreements, which are to be treated legally in the same way as parts of volume licenses upon first acquisition.
• The software itself is always the same original software that is also obtained through official download channels or manufacturer sources. You are therefore not paying for a different or inferior version, but for a valid activation key or a corresponding license.
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