If you are large business, then you pay a much larger price tag since you will need to buy more CALs. If you are a small business, then you pay a relatively small price tag since you only have to buy a few CALs. The Server+CAL model is a way for Microsoft to scale the pricing of its solutions. On their website, Microsoft provides the following images to illustrate the differences between User CALs and Device CALs: The people using that device do not need a User CAL. Then, anyone using that device would be able to access the server. On the other hand, a “Device CAL” licenses the endpoint device so that the device itself has permission to access the server. They can access it from as many different endpoints as they want since the CAL is tied to the person, not the device. A “User CAL” licenses the person so they have permission to access the server. They are talking about a “Client Access License.” When one of their server products is licensed using the Server+CAL model, then you have to buy a server license to install the software on the server and you have to buy CALs for the people or machines that will access that server. When Microsoft says “CAL,” they’re not talking about California, calories, or calibers. What exactly do those terms mean and which type should you buy? We often get questions about the differences between User CALs and Device CALs, and which is more appropriate.

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