Microsoft Windows Server Client Access Licenses (CALs)
A Windows Server CAL is a license that allows customers to access Windows Server. CALs are used in conjunction with Microsoft Windows Server OS licenses to allow Users and/or Devices to access and utilize the services of that server OS.
If your customers are wanting to run Windows Server on their new HPE Gen10 server, they would acquire a Windows Server OS license in order to run the Windows Server software on the physical server AND they would need to acquire CALs for the Users or Devices who will access the server.
This two-component license models provides a low entry price and a way to pay for capacity used: the more devices or users accessing the server software, the greater the license fees or price. This model therefore offers license affordability to organizations of all sizes.