There’s a new (February 2025) Base and Additive CALs licensing guidance document from Microsoft which is an evolution of the October 2020 Microsoft Server Base and Additive CALS Overview Licensing Brief document. It’s broadly the same information covered, but all the diagrams showing the layered structure of Base and Additive CALs are removed to be replaced with more comprehensive explanations and links to the Product Terms.

Find this new document here: https://bit.ly/4b5Lzn3.