Windows Server 2025 Upgrades Now Available via Windows Update

Microsoft has introduced a new upgrade path for Windows Server 2025, allowing administrators to perform in-place upgrades directly through Windows Update, removing the need for installation media and simplifying deployment across environments.

In-place upgrades now available through Windows Update

The new capability supports upgrades from Windows Server 2019 and Windows Server 2022. Instead of mounting ISO files or relying on external media, admins can now trigger the upgrade through the familiar Windows Update interface. This change streamlines the process, especially for organizations managing large fleets of servers.

Microsoft notes that most applications and services should continue working after the upgrade. However, full compatibility is not guaranteed, so validation remains essential before rolling out the update broadly. The company advises IT teams to approach the process carefully, especially in production environments.

Before starting the upgrade, administrators should plan maintenance windows, verify activation methods such as KMS, and confirm sufficient disk space. Proper Group Policy configuration also plays a role in ensuring the upgrade completes without interruptions. Testing the process in a lab environment remains a key recommendation to avoid unexpected issues.

There is one critical limitation. Microsoft explicitly warns against using in-place upgrades for Domain Controllers. These systems should instead follow a clean installation approach to avoid potential risks to directory services and authentication infrastructure.

Deployment strategy and post-upgrade checklist

For deployment, Microsoft recommends starting with less critical servers. This staged rollout allows teams to identify and resolve issues early. The upgrade process takes around two hours per server on average, though actual duration depends on workload and system configuration.

After the upgrade completes, administrators should verify that all applications and services function correctly. Activation must be confirmed using KMS, AD-based activation, or MAK, depending on the setup. Teams should also review telemetry settings, check for additional updates, and remove the Windows.old folder to reclaim disk space. Evaluating security features such as Secured-core and UEFI Secure Boot is also part of the post-upgrade checklist.

Overall, the new Windows Update-based upgrade path simplifies what has traditionally been a more complex process. At the same time, it still requires structured planning and validation, especially for production systems.

In related developments, Microsoft recently addressed an issue that was triggering unintended Windows Server 2025 automatic installations. The company has also released emergency updates to resolve server crash problems, signaling continued focus on stabilizing the platform.

Via Neowin