Windows Server

Windows Server, Microsoft's primary OS (operating system) for servers, is a prerequisite for all Microsoft server applications (except for SQL Server 2017/2019, which also runs on Linux). In volume licensing programs, Windows Server 2016 and 2019 is licensed under the Core/CAL License Model, and versions 2012 and 2012 R2 are licensed under the Processor/CAL License Model. Among other things, the License Models dictate the number and type of core or processor licenses required under various scenarios, including virtualization.

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