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Previous versions of Windows Server have also been transitioned to this licensing model. The Standard edition of Windows Server 2019 uses a combination of core-based licensing and CALs.
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Client access licenses (CALs) aren't needed. It allows only one instance of the server software to be run in the physical or virtual environment (Essentials edition licenses can't be combined).
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If you need to run additional virtual instances, you can acquire more Standard licenses. It allows you to run two instances of the server software in a virtual operating system on the licensed server.
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