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In a traditional setup, licensing for servers can be complex, especially in hybrid environments. Cloud-native licensing models for your Azure Arc-enabled servers provide flexibility and reduce overhead, so you can avoid buying perpetual licenses and doing annual true-ups for compliance. This shift lets you handle your Windows and SQL Server licensing like a cloud service: you only pay for what you use, when you use it, and you can manage it all centrally through Azure. For a system administrator, this means less time tracking license keys or entering activation codes, and more confidence that your servers are properly licensed and receiving critical updates.
Let's take a look at some of the licensing options enabled by Azure Arc.
Windows Server Pay-as-you-go
Historically, if you ran Windows Server on-premises, you activated it with a product key and that was that. With Azure Arc, Microsoft introduced an alternative: Windows Server Standard Pay-in-Advance Offer licensing via Azure.
Essentially, this model turns Windows Server into a subscription. Rather than worrying about buying new licenses for new servers, just connect them to Arc and enable Pay-as-you-go. This is great for environments that fluctuate, or for avoiding large upfront costs. It also enables compliance, since Azure handles the metering.
With this licensing model, you connect your server to Azure Arc and enable Pay-as-you-go in the Azure portal (or alternately, enable it when you install the OS and then connect to Azure Arc). The server then uses Azure for activation and billing, without requiring a product key. You'll see charges on your Azure bill per core, per hour for that server's OS license, similar to how Azure virtual machine (VM) pricing includes Windows licensing. If the server is shut down, you can stop billing by disabling the feature for that machine.
Pay-as-you-go is currently available for Windows Server 2025 and beyond, with the same pricing for Standard or Datacenter editions. Importantly, no client access licenses (CALs) are required for base functionality.
Centralized purchasing and FinOps
By shifting server licensing to Azure subscriptions, you can streamline procurement and improve compliance. Rather than buying licenses once and hoping they're used efficiently, pay-as-you-go means you pay exactly for what's running. If a server is decommissioned, the cost drops automatically. If you deploy an extra SQL Server instance for a week, you pay just for that week.
These processes align with FinOps (Cloud Financial Management) principles: turning software costs into measurable, adjustable cloud spend. It also means no more true-up surprise bills: everything is in your Azure invoice and can be analyzed with Microsoft Cost Management and Billing.
Licensing and patching together
Another benefit of Azure Arc's license integration is how it ties into patch management. This integration enables you to treat servers on down-level, unsupported OS versions just like supported ones in your patch cycles; Azure Arc takes care of making sure the updates flow for all servers. For instance, once a Windows Server 2012 server is enrolled in ESUs enabled by Azure Arc, Azure Update Manager knows that the server is eligible for patches and includes it in compliance reporting.
Similarly, for Windows Server Standard Pay-in-Advance Offer, the Azure portal can show which Arc servers are using Standard Pay-in-Advance Offer and are activated, so you don't accidentally let one slip unlicensed. It's a far more transparent and automated system compared to keeping a spreadsheet of product keys, allowing you to transform those annual licensing headaches into a simple "just check Azure" routine.