A 4-vCPU Windows Server VM needs 8 core licenses to run under Azure Hybrid Benefit. Not 4. Eight. That one line from Microsoft's docs is where most hybrid-benefit savings quietly leak. Everyone knows AHB makes a Windows VM bill at the Linux compute rate. Far fewer people do the license math per VM instead of per vCPU. Here is the math, on an illustrative fleet I invented (call it ExampleCo, not a real company): - 40 VMs at 4 vCPU - 20 VMs at 8 vCPU - 6 VMs at 16 vCPU Total vCPU: 416. Core licenses needed: 576. The gap is 160 cores, and it comes entirely from the 40 small VMs: 40 x 8 = 320 licenses to cover 160 vCPU. The floor is per VM, so a fleet of small VMs is the most expensive way to hold the same number of cores. What the Microsoft Learn page says (checked 2026-10-26, always confirm against your own agreement and the Product Terms): 1. Minimum 8 core licenses per VM, Standard or Datacenter, with active Software Assurance or a qualifying subscription. 2. A processor license counts as 16 core licenses. 3. Workloads may only run under the benefit during the SA or subscription term. If it lapses, you renew, disable the benefit, or deprovision. Silence is not an option. 4. Standard licenses: on-prem OR Azure, with a one-time 180-day migration overlap. Datacenter VM licensing allows overlap during migration without the 180-day cap. 5. Windows Server AHB is managed per resource. The central scope-level assignment is SQL Server only. Three things worth doing this week: First, inventory. Pull every Windows VM from Azure Resource Graph and look at licenseType. Anything null is paying the full Windows rate. Whether you own the licenses to cover it is the second question, but you can't answer it without the list. Second, count licenses with the floor applied, per VM. Spreadsheets that multiply vCPU by VM count undercount. Third, before you merge small VMs to "fix" the floor, check HA, zone placement, app support and blast radius. Two 4-vCPU VMs becoming one 8-vCPU VM saves 8 licenses in the model and might cost you a resilience story in real life. The license math is an input, not the decision.

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