Pooling, Multiplexing Changes Complicate Upgrades

Multiplexing and pooling reduce the number of devices or users that directly access Microsoft servers, and Microsoft has rules in place to ensure that customers purchase enough Client Access Licenses (CALs) for servers that require them. Microsoft's definitions of multiplexing and pooling have become broader, however, triggering new CAL requirements. The changes could substantially boost Microsoft's revenues, but they are complex and Microsoft has not documented all of them.

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