AZ-900 Describe Azure management and governance Practice Question
Which Azure feature reduces costs by allowing customers to use existing on-premises Windows Server licenses in Azure?
⚠ Common exam trap
Watch out — candidates often confuse Azure Hybrid Benefit with Azure Reserved Instances, mistakenly thinking that reserved pricing is the mechanism for using existing licenses, when in fact Hybrid Benefit is the specific feature for license re-use.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Azure Hybrid Benefit for Windows Server
Azure Hybrid Benefit for Windows Server allows customers to use their existing on-premises Windows Server licenses with active Software Assurance (or subscription licenses) to run Windows Server virtual machines in Azure at a reduced cost. This benefit effectively covers the Windows Server operating system licensing cost, so customers only pay for the underlying compute (VM) infrastructure, leading to significant savings.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Azure Reserved Instances
Why it's wrong here
Azure Reserved Instances provide a billing discount in exchange for a one-year or three-year commitment to a specific VM size, region, and tier, reducing compute costs by up to 72% compared to pay-as-you-go. However, they do not use your existing Windows Server licenses — you continue to pay the OS license fee separately (unless you also enable Hybrid Benefit). Because the question focuses on reusing existing license investments, Reserved Instances address capacity commitment rather than licensing, so they are incorrect.
- ✓
Azure Hybrid Benefit for Windows Server
Why this is correct
Azure Hybrid Benefit for Windows Server is a licensing benefit that lets you reuse qualifying Windows Server licenses (with active Software Assurance or subscription) on Azure VMs, saving up to 40% on Windows Server VM costs by reducing the underlying OS licensing expense. Unlike capacity-based discounts, it directly leverages your existing on-premises license investment, making it the correct answer for maximizing value from licenses you already own. To apply it, you select Hybrid Benefit at VM provisioning time or after; you still pay for compute, storage, and other services.
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Azure Spot VMs with Windows
Why it's wrong here
Azure Spot VMs let you use Azure's unused compute capacity at a deeply discounted price — often 80–90% off pay-as-you-go — but they can be evicted at any time when Azure needs the capacity back, so they are designed for interruptible workloads like batch processing or CI/CD. While you can run Windows on a spot VM, the OS license is still charged unless you separately apply Hybrid Benefit, and the instability contradicts the need for a stable cost-saving solution. Spot VMs are about low-price capacity, not reusing existing Windows Server licenses, hence they are incorrect.
- ✗
Azure Free Tier VMs
Why it's wrong here
The Azure Free Tier offers new accounts a limited quantity of specific VM types, such as B1s and B2pts, for free for a set period (typically 12 months) or up to 750 hours per month, which is a promotional allowance rather than a licensing mechanism. It does not account for your existing Windows Server licenses, and it provides only low-cost developer/test resources, not scalable production capacity. Relying on free tier VMs would not deliver the savings or license optimization described in the scenario, making it a wrong choice.
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