Includes activation license key.PRODUCT INFORMATION:Windows Server 2019 is built on the strong foundation of Windows Server 2016 which continues to see great momentum in customer adoption. Windows Server 2016 is the fastest adopted version of Windows Server, ever! You must have a Windows server 2019 OS and activate it first, Then You can use this key to activate 50 Device RDS Cals. You cant use this key to activate Windows Server 2019 OS.