A chart depicting downgrade rights for the Pro and Enterprise editions of Windows is available in the Windows 10 Commercial Licensing Guide.
We also reported to be surprised that the Windows Server Remote Desktop Services Client Access License (Windows Server RDS CAL) was the only Windows Server additional CAL not being available. If you're the Microsoft 365 admin of an Office for business plan, users in your organization can only install Office using the steps in this topic as long as your plan includes the desktop version of Office, and you've assigned the user a license and given them permission to install Office (Manage software download settings in Microsoft 365). We reported earlier on the new Server Subscriptions for Azure in the Microsoft Cloud Solutions Provider Program.