CALs Drive Server Licensing Costs and Compliance

Most Microsoft server products are licensed under the Server + CAL model, which generally requires a server license for servers running the server product and a Client Access License (CAL) for each client user or device accessing these servers. CALs generally comprise a majority of total server licensing costs, and rules associated with CALs determine what types and versions are required, when and how many are needed, and how to buy them.

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