Hotpatching, the ability to patch a Windows OS without requiring a reboot for the patch/update to take effect, is now available at no cost for Azure Arc-enabled machines running Windows Server 2025.
<taken from Azure Update Manager docs>
As of May 19, 2026, Hotpatch on Azure Arc-enabled machines running Windows Server 2025 Standard or Datacenter is available at no additional cost. There is no per-core meter, no hourly charge, and no separate Hotpatch line item on your invoice.
- Existing enrolled servers: Billing has been stopped for all servers previously enrolled in Hotpatch. No action is required. These machines remain enrolled and continue to receive hotpatch updates when available.
- New enrollments: Enabling Hotpatch on eligible Windows Server 2025 Arc-enabled machines incurs no Hotpatch charges, regardless of the underlying environment (VMware, Hyper-V, AWS, GCP, or other on-premises and multicloud environments) or edition (Standard or Datacenter).
Read the note online at:
https://learn.microsoft.com/en-us/azure/update-manager/manage-hot-patching-arc-machines?tabs=manage-scale%2Chotpatch-scale#billing-considerations
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