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Microsoft Releases Windows 11 26H2 ISOs Free for Limited-Time Enterprise Evaluation

Microsoft has released Windows 11 26H2 Enterprise Evaluation ISOs, allowing IT professionals and organizations to test the upcoming Windows release free for 90 days before broader deployment.

By Khurram Shahzad

Cloud & Virtualization Enthusiast

📅 Published: Sep 19, 2026

⏱ 5 min read

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Microsoft

Windows 11
26H2 Evaluation ISO

Free 90-day evaluation for enterprise and IT professionals

Build 26300.9457 90-Day Trial Enterprise Evaluation

Microsoft has released Windows 11 26H2 evaluation installation media for enterprise and IT testing.

💡 Key Takeaways

Microsoft has released Windows 11 26H2 Evaluation ISOs.
The evaluation is available free for 90 days.
The ISO is primarily designed for enterprises and IT professionals.
The released media is based on build 26300.9457.
Organizations can use it to test application, hardware and deployment compatibility.
Microsoft has also been preparing Windows 11 26H2 for broader availability.

What’s New?

Microsoft has started publishing Windows 11 version 26H2 evaluation installation media for organizations and IT professionals.

The new ISO provides a convenient way for administrators to create controlled test environments and evaluate how the upcoming Windows release behaves with existing applications, drivers, security tools, hardware and deployment processes.

According to the latest report, the evaluation media is based on Windows 11 26H2 build 26300.9457, which includes the KB5129195 out-of-band update.

Key Details

Operating System: Windows 11
Version: 26H2
Evaluation Type: Enterprise Evaluation
Evaluation Period: 90 days
Build: 26300.9457
Update: KB5129195
Target Audience: Enterprises and IT professionals
Primary Purpose: Compatibility, deployment and readiness testing

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Windows 11 26H2 evaluation media gives organizations an opportunity to validate their environments before broader deployment.

— VMoreCloud analysis based on Microsoft’s evaluation model

🧪 Technical Details

The evaluation ISO is based on build 26300.9457, corresponding to the KB5129195 out-of-band update. The evaluation media provides a ready-to-deploy installation environment for testing Windows 11 26H2 in lab or controlled environments.

Why Should Enterprises Test Windows 11 26H2?

Before deploying a major Windows release across an organization, IT teams typically need to validate hardware, applications, security software and management infrastructure.

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Hardware Testing

Validate devices, drivers, firmware and peripherals before deployment.

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Application Compatibility

Test business applications and line-of-business software.

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Security Validation

Check endpoint security, authentication and management tools.

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Deployment Planning

Validate imaging, provisioning and update workflows.

Free 90-Day Evaluation

Microsoft is providing the Windows 11 26H2 Enterprise Evaluation software at no cost for a limited evaluation period.

The evaluation software is intended for testing rather than permanent production deployment. Microsoft says its Enterprise Evaluation software is designed for IT professionals evaluating Windows 11 on behalf of their organizations.

Microsoft currently describes its Enterprise evaluation software as a 90-day evaluation that requires registration before downloading. 1

Who Can Use the ISO?

The evaluation media is primarily aimed at:

IT administrators
Enterprise organizations
System administrators
Software and application testing teams
Hardware and driver testing teams
Windows deployment specialists
Developers testing Windows compatibility

Microsoft specifically states that its Enterprise evaluation software is designed for IT professionals and organizations managing corporate networks and devices. 2

⚠️ What About Home Users?

The evaluation ISO is primarily intended for enterprise and IT testing. Home users who simply want the regular Windows 11 installation media should use Microsoft’s standard Windows 11 download channels rather than relying on an Enterprise Evaluation build.

Windows 11 26H2 Uses an Enablement Package

Windows 11 26H2 follows Microsoft’s recent servicing approach. Microsoft says the release builds on the same platform and servicing approach used by previous releases.

For compatible devices already running recent Windows versions, 26H2 is expected to be delivered through a relatively small enablement package rather than replacing the entire operating-system platform. 3

What This Means for IT Teams

The arrival of the evaluation ISO gives organizations another practical way to prepare for Windows 11 26H2.

IT teams can build a test environment, install the evaluation image, deploy their applications and security tools, and identify potential compatibility issues before rolling the update into production.

This is particularly useful for organizations managing large numbers of Windows endpoints, virtual desktops or standardized corporate images.

☁️ Useful for Virtualization Labs

IT professionals can also use evaluation media to create isolated Windows 11 26H2 test machines in virtualization environments. This can be useful for validating applications, policies, endpoint management and deployment workflows before production rollout.

Download Windows 11 26H2 Evaluation ISO

IT professionals can register through Microsoft’s Windows 11 Enterprise Evaluation Center to access the evaluation download.

Download from Microsoft →

⚠️ Important Before Installation

Back up important data before installing an evaluation build. Microsoft notes that installing Windows 11 Enterprise Evaluation from an ISO can require a clean installation to return to a previous operating system. 4