For OEMRET, upgrades will retain the OEM channel license, but the media must match the same edition family (Standard → Standard, Datacenter → Datacenter).
Below is a structured technical report based on available information and standard analysis for such a build. Windows Server 2025.26100.1742-OEMRET-x64FRE-en...
The identifier Windows Server 2025.26100.1742-OEMRET-x64FRE-en-us is far more than a simple filename. It tells a detailed story of a stable, production-ready operating system designed for the hybrid cloud era. Understanding its components allows IT professionals to accurately source, deploy, and manage the correct software within their infrastructure, ensuring both compatibility and security for years to come. For OEMRET, upgrades will retain the OEM channel