Server 2025.26100.1742-oemret-x64fre-en... - Windows

Windows Server 2025 (build 26100.1742) represents a significant leap forward in Microsoft’s flagship server operating system, bringing substantial improvements in security, hybrid cloud integration, and performance. The specific build , identified as the OEMRET-x64FRE-en image, signifies the generally available (GA) release, making it the foundational ISO for OEM (Original Equipment Manufacturer) and retail deployment of the latest Long-Term Servicing Channel (LTSC) release.

Understanding what each segment of this nomenclature represents ensures that infrastructure engineers and IT procurement professionals deploy the exact licensing channel, language pack, and performance parameters required for their datacenter architecture. Decoding the Filename: What the Nomenclature Means

To validate the image:

If you need a stable, supported Windows Server, you should download the official or join the Windows Insider for Server program to get the official vNext previews directly from Microsoft. Any ISO labeled "Server 2025" is, at best, an unofficial rename of a beta build.

| Update KB | OS Build | Release Date | Key Improvement | | :--- | :--- | :--- | :--- | | KB5043080 | 26100.1742 | Sep 2024 | Initial RTM Cumulative Update | | KB5065426 | 26100.6584 | Sep 2025 | Network/Domain Controller stability | | KB5068861 | 26100.7171 | Nov 2025 | Security fixes and servicing stack improvements | | KB5070881 | 26100.6905 | Oct 2025 | Out-of-band security update | Windows Server 2025.26100.1742-OEMRET-x64FRE-en...

This is the English language release of the latest Windows Server 2025 preview/release. Suitable for fresh installs on bare metal or virtualization platforms.

The -OEMRET tag indicates:

For those tracking the latest releases, the ISO is making the rounds. Windows Server 2025.26100.1742-OEMRET-x64FRE-en-US.iso