Hello,
The main functions and differences between Windows Server CAL and Windows Server RDS CAL are as follows:
- Windows Server CAL:
Allows users or devices to access basic Windows Server services, such as file sharing and printing services.
(Image source: Client Access Licenses (CAL) & Management Licenses | Microsoft Volume Licensing)
- Windows Server RDS CAL:
RDS CAL is specifically used to access remote desktop services on Windows Server. If a user or device needs to connect to a server via the Remote Desktop Protocol (RDP), RDS CAL is required.
(Image source: License your RDS deployment with client access licenses (CALs) | Microsoft Learn)
Differences:
Windows Server CAL is used for basic server function access, while RDS CAL is an access license specific to remote desktop services, and often the two licenses are used in combination to meet production needs.
I hope this helps. If you have any further questions, please contact us.
Best regards
Jacen