Microsoft on Tuesday introduced two pay-as-you-go plans for the enterprise. Windows 10 Enterprise E3 in CSP is "basically the OS wrapped with security and management delivered as a subscription," said Rob Enderle, principal analyst at the Enderle Group. The Surface as a Service Program lets Microsoft CSPs who are also Surface Authorized Distributors use a managed service offering to provision Microsoft resellers and customers with Surface devices, as well as managed cloud services, Office 365, Windows 10, and other products.