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Licensing brief: Multiplexing—Client Access License (CAL) requirements

Applies to all Volume Licensing programs


This brief explains how multiplexing impacts the licensing of Microsoft server operating systems and server products licensed under the Microsoft server/Client Access License (CAL) model. "Multiplexing" is when customers use hardware or software to pool connections, reroute information, or reduce the number of devices or users that directly access or use a product. Multiplexing can also include reducing the number of devices or users a product directly manages.

What’s new in this brief

This brief, published April 2014, replaces a previous version published December 2012. Changes include updates to reflect that Microsoft SQL Server is licensed on a per core basis.

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