Windows Server 2025.26100.1742-oemret-x64fre-en... 2021 -

: Indicates a combined "OEM" (Original Equipment Manufacturer) and "Retail" installation media, designed to support both license types.

Windows Server 2025 introduces significant upgrades in security, performance, and hybrid cloud integration. What's new in Windows Server 2025 | Microsoft Learn Windows Server 2025.26100.1742-OEMRET-x64FRE-en...

: "x64" denotes the 64-bit architecture, while "FRE" stands for "Free" (the standard retail/production version, as opposed to a "Checked" or debug version). en : Specifies the English language edition. Core Advancements in Windows Server 2025 Windows Server 2025.26100.1742-OEMRET-x64FRE-en...

: The specific OS build number identifying the GA version. Windows Server 2025.26100.1742-OEMRET-x64FRE-en...