I want to know if is it possible to install ArcGIS Portal on the Windows OS (other than Linux).
Can ArcGIS Portal be installed without ArcGIS Desktop?
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Yes you can install it on a machine using Windows http://server.arcgis.com/en/portal/latest/install/windows/welcome-to-the-portal-for-arcgis-installation-guide.htm
The machine does not need to be running ArcGIS Desktop http://server.arcgis.com/en/portal/latest/install/windows/portal-for-arcgis-system-requirements.htm