Windows 10: Active Directory Server - CAL Requirement

Hello, Does an Active Directory managing server require user/device CALs covering all users/devices in our organization? What are the server functionalities being accessed by AD for these resources which require a CAL?Thank you.

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If one user has two email IDs on exchange server, does the user need to be licensed with two Active Directory User CALS?

The question is specific to the requirement of User CALs for Windows Active Directory. User has both Active Directory and Exchange Server installed.

 

Activate RDS CAL 2019 on Windows Server 2016

Dear Microsoft Support,



We recently purchased Windows Server RDS CAL 2019.

When we tried to install Windows Server RDS CAL 2019 into Windows Server 2016, it shows the license is not recognized and couldn’t install.



My questions are :

1. Can’t Windows RDS CAL 2019 be installed in Windows Server 2016? If can, how?
2. Is there any way to downgrade RDS CAL from 2019 to 2016 version?

Thanks,

 

CAL License Clarification

I want to know about the CAL (Client Access License), Is it necessary to purchase the CAL license. if we use to access the Server without domain or active directory setup. Please help.