Windows SharePoint Services is an enabling technology that is included in Windows Server 2003 and is available separately as a free download. It helps teams stay connected and productive by providing easy access to the people, documents, and information that they need to make well-informed decisions and get work done. This set of services takes advantage of the performance, stability, and security features of the Microsoft .NET Framework. The Microsoft SharePoint Portal Server 2003 application is based on Windows SharePoint Services. Windows SharePoint Services is a set of services that you can use to create and maintain many team sites, and SharePoint Portal Server 2003 is a server product that adds features you can use to build and manage integrated, large-scale portal solutions.
Solution developers for SharePoint Products and Technologies now need to know only one user interface technology (ASP.NET Web pages and controls) and one SharePoint Products and Technologies object model to create advanced sharing solutions with SharePoint Products and Technologies.