You need CALs for things like Domain users (people logging in to managed desktops), Sharepoint users, and Exchange accounts. Your business's internal users of M

You need CALs for things like Domain users (people logging in to managed desktops), Sharepoint users, and Exchange accounts. Your business's internal users of Microsoft products. Your own code running on Windows Server, no. MS charges editions of things like SQL Server and IIS based on functionality, cores, nodes, etc.