In addition to the license that is required to install and run Windows 2000 Server, and the license that is required to install and run an operating system on each client computer, you also need a Client Access License for each client connection to the server. The licensing modes in Windows 2000 are the same as in Windows NT 4.0: you can select either the Per Seat or Per Server licensing mode.

Client Access Licenses are not required for the following services:

Licensing Windows 2000 Professional is still accomplished by entering the Product ID found on the packaging materials.