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Microsoft licenses Windows by access device: In case using Virtual Desktop Infrastructure (VDI), Windows Software Assurance or Windows Virtual Desktop Access (VDA) licenses are required.In case using Microsoft Hyper-V as a hypervisor, Microsoft Windows Server Operating System (OS) Licenses are required.Licensing of Microsoft Desktop Application Software for use with Windows Server RDS.This makes it possible for three or more users to connect to a remote desktop (RD Session Host) for a specific Virtual Machine in Compute Resource (for SPLA partners). RDS SAL is a service that provides a Microsoft Remote Desktop Service Subscriber Access License (called an “RDS SAL”) on Virtual Machines created in Compute Resource.Regular User or Device CALs are required in addition to the RDS User or RDS Device CALs. You may choose to combine RDS Device CALs and RDS User CALs simultaneously with the server software. If you have multiple servers, you need multiple external connectors in addition to any required Windows Server External Connectors.
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RDS External Connector: Permits multiple external users to access a single Remote Desktop server.RDS User CAL: Permits one user (using any device) to use Remote Desktop Services functionality on any of your servers.RDS Device CAL: Permits one device (used by any user) to use Remote Desktop Services functionality on any of your servers.The following types of RDS CAL are available: RDS CALs are required for users or devices that want to utilize Remote Desktop Service functionality on Windows Server.If Windows Server is accessed remotely (for non-administrative work) then you need a Remote Desktop Service (RDS) access license:
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Windows Server OS to be accessed must be covered by Microsoft Windows Server Client Access Licenses (CALs).
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