While you have the right to use them, a 2012 license server won't automatically "know" how to handle a 2025 key. You often have to call the Microsoft Clearinghouse to have them manually downgrade the key for your legacy environment. Where to Buy Today

Buy Windows Server 2022 or 2025 RDS CALs.

While the software is aging, many businesses still rely on it for critical legacy applications. Here is the reality of acquiring Remote Desktop Services (RDS) Client Access Licenses (CALs) in 2026. The Problem: Legacy Licenses are "End of Sale"