The most cost-effective licensing solution to recommend for the customer, who plans to migrate some workloads to Microsoft Online Services while retaining some workloads on-premises, is Microsoft 365 Enterprise E3 User Subscription Licenses (USLs). Microsoft 365 Enterprise E3 includes Office 365, Windows 10 Enterprise, and Enterprise Mobility + Security. This comprehensive licensing package will ensure that users have access to the necessary services and the latest Windows features without the need for additional Enterprise CAL Suite user licenses.

