I manage IT for a small organization and have been handling our Microsoft licensing and virtualization environment for many years. We recently moved from a two-host VMware Essentials Plus setup to Proxmox. I purchased two 16-core packs of Windows Server 2025 Datacenter, expecting to run an as-yet-unknown number of Windows Server Standard virtual machines, including versions 2025, 2022, and 2019.
Previously, downgrade and down-edition keys were automatically available through the volume licensing portal. Now the Microsoft 365 admin center only shows Datacenter keys for the supported versions. My understanding is that Standard keys and downgrade media are still available, but must be requested separately.
The VAR that sold me the licenses initially resisted when I asked for Windows Server Standard keys. When they eventually responded, they suggested simply installing Datacenter because I supposedly would not notice a difference. I was uncomfortable with that advice because I had assumed that installing an edition with features we do not need conflicted with security and least-privilege principles. They also said none of their other customers had requested down-edition keys since licensing moved to the Microsoft 365 admin center.
Is requesting these keys an unusual or unreasonable request? Is the VAR being unhelpful or simply unfamiliar with the current Microsoft licensing process?
4 Answers
The security argument is the part that is off. Standard and Datacenter use essentially the same underlying operating system. Datacenter adds licensing rights and features such as unlimited virtualization, Storage Spaces Direct, and software-defined networking, but those capabilities are not automatically enabled or exploited just because Datacenter is installed. Installing Datacenter does not inherently violate least privilege; administrative permissions, enabled roles, configuration, and hardening are what matter.
A small VAR may be good at infrastructure projects while being weak at licensing administration. If you are not a fully managed client, licensing research may fall between their sales and technical teams, so nobody has much incentive to investigate it. I would separate the two issues: decide whether Standard is genuinely better for your deployment, then judge the partner based on whether they can accurately document your downgrade rights and obtain the required keys. Their lack of previous requests is not evidence that your request is invalid.
The VAR should at least know how to submit the request. Downgrade rights are still part of the licensing terms, but the keys are no longer necessarily exposed through self-service tools. Depending on how the licenses were purchased, the partner may need to open a request through Microsoft Partner Center for the appropriate media and keys. The fact that other customers have not asked for them is not a valid reason to dismiss the request.
That clarification helps. I was treating the missing keys as a licensing problem when it may really just be a support-process issue. I will ask them to submit the formal request and consider a different licensing partner if they refuse.
The advice to install Datacenter is not necessarily wrong, although the explanation was poor. Since you bought Datacenter licensing, using Datacenter may be the simplest option, especially if you might add more Windows VMs later. However, because the hosts are running Proxmox rather than Hyper-V, you should not assume Datacenter will automatically activate the guest VMs through AVMA. You will still need an appropriate activation method, such as KMS, Active Directory-Based Activation, or MAK keys.
As for the VAR, this sounds more like a partner that does not specialize in Microsoft licensing than proof that it is technically incompetent. If they sold the licenses, though, they should either handle the request or clearly explain the correct process instead of treating an uncommon request as unreasonable.
There can still be practical reasons to standardize on Standard, such as matching future deployments or avoiding a later Datacenter-to-Standard migration, but that is a lifecycle and cost concern rather than a direct security boundary.