Windows Server 2025 Build 26100.32860 Download (KB5087539)
Find the official Windows Server 2025 download options, learn what build 26100.32860 represents, and review the safest way to install or update a server for testing and deployment.
Download Windows Server 2025
Choose the appropriate official source for your purpose. Evaluation media is for testing; production deployments require suitable licensing and media access.
Microsoft Evaluation Center registration may be required. The evaluation edition expires after 180 days; Microsoft says evaluation installations must be activated over the internet within the first 10 days to avoid automatic shutdown.
Windows Server 2025 is designed for on-premises infrastructure, virtualization hosts, application services, storage, identity services, and hybrid-cloud environments. Build 26100.32860 corresponds to the May 2026 cumulative security update KB5087539. This page is a software download guide, not a claim that the evaluation ISO itself is pinned to that build.
Product
Windows Server 2025
OS build
26100.32860
Update ID
KB5087539
Windows Server 2025 build 26100.32860 overview
Microsoft lists OS build 26100.32860 as the May 12, 2026 update for Windows Server 2025. KB5087539 contains security fixes and quality improvements, including fixes and changes accumulated from earlier servicing updates. Check the official support article for the full details, prerequisites, known issues, and deployment notes.
| Property | Details |
|---|---|
| Product | Windows Server 2025 |
| Version / release family | 24H2 / OS build family 26100 |
| Specific OS build | 26100.32860 |
| Associated cumulative update | KB5087539 |
| Release date | May 12, 2026 |
| Architecture | x64 (64-bit) |
| Official evaluation media | ISO and VHD options from Microsoft Evaluation Center; current media may be newer than this build. |
Official download options
Option 1: Windows Server 2025 evaluation ISO
Use Microsoft Evaluation Center to download Windows Server 2025 evaluation media. The ISO provides Standard and Datacenter evaluation options, with installation choices such as Server Core and Server with Desktop Experience. Select the required language and format on Microsoft’s page.
Open Microsoft Evaluation Center
Option 2: Install KB5087539 on an existing server
If you already run Windows Server 2025 and specifically need build 26100.32860, use Microsoft’s update documentation and your approved servicing channel. Search the Microsoft Update Catalog for KB5087539 if you need the standalone update package, and verify that the package matches Windows Server 2025 and the target architecture.
Search Microsoft Update Catalog
Editions and installation options
| Option | Best suited for | Notes |
|---|---|---|
| Server Core | Production servers and administrators comfortable with remote management | Smaller installation footprint; no full local desktop GUI. |
| Server with Desktop Experience | Labs, learning, and administrators who prefer a local GUI | Includes the graphical desktop experience. |
| Evaluation ISO | Testing, learning, proof-of-concept, and lab deployments | Time-limited evaluation; review Microsoft’s conditions. |
| Licensed production media | Business and production workloads | Obtain media through the organization’s eligible Microsoft licensing channel. |
Installation guidance
- Confirm requirements. Review the official Windows Server hardware requirements and verify CPU, memory, storage, firmware, and network compatibility.
- Choose the right media. Use Evaluation Center for a trial or your organization’s licensed source for production media.
- Back up your system. For upgrades or existing servers, take a verified backup and plan a rollback window.
- Install in a test environment first. For virtual machines, confirm virtual hardware compatibility, firmware mode, storage, and network configuration.
- Apply updates. After setup, run Windows Update and follow your organization’s patch-management process.
- Check activation and licensing. Evaluation media is time-limited; production servers require the correct licensing and activation route.
How to verify the installed build
After installation or updating, open PowerShell as an administrator and run:
Get-ComputerInfo | Select-Object WindowsProductName, WindowsVersion, OsBuildNumberYou can also run winver or check the OS version in Settings. Confirm that the reported build matches the target you need. If the machine shows a newer build, it may have received later cumulative updates.
Licensing and evaluation notes
- The public Evaluation Center provides time-limited evaluation media, not a perpetual production license.
- Microsoft states that Windows Server 2025 evaluation expires after 180 days and must be activated online within the first 10 days to avoid automatic shutdown.
- Production deployment should use appropriately licensed media and activation.
- Do not use unofficial repacks or modified ISOs for production servers. Verify the publisher and integrity of any downloaded installation media.
Final thoughts
Windows Server 2025 build 26100.32860 identifies the May 2026 cumulative update KB5087539. For a fresh lab installation, Microsoft’s Evaluation Center is the safest official starting point; for an existing server that must reach this exact build, use the Microsoft update documentation and Update Catalog, then verify the resulting build. Always distinguish evaluation media from licensed production media.
Download from Microsoft
Use official installation media and confirm the update build before deploying to a production environment.
Official sources
- Microsoft Evaluation Center — Windows Server 2025 ISO and VHD
- Microsoft Support — May 12, 2026 KB5087539 (OS Build 26100.32860)
- Microsoft Learn — Windows Server release information
- Microsoft Update Catalog — KB5087539 search
- Microsoft Learn — Windows Server hardware requirements
Editorial note: VMoreCloud links to official Microsoft download and update resources. The exact build of a currently offered evaluation ISO has not been independently verified; confirm the build after installation before using it in a lab that requires a pinned version.
