A user is a person running Microsoft software on a client device, accessing software on a server, or making use of an online service.

Some Microsoft products offer user-based licensing as an option, or simply mandate it.

Server products. In volume licensing programs, an option for server products sold under the Server/CAL License Model, Processor/CAL License Model, of Core/CAL License Model is to purchase User CALs for each unique user. (The alternative to user-based licensing for these products is to license client devices with Device CALs.)

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