Windows SharePoint Services (WSS), or Windows SharePoint, is a free add-on to Windows Server 2003 made available by Microsoft. It offers basic web portal and intranet functionality, including portal pages called web part pages made up of web parts (developed in ASP.NET), team, document or project sub-sites, version-controlled document storage, and basic search functionality. It is made up of an ASP.NET web site hosted on Internet Information Services 6.0, using a Microsoft SQL Server or Microsoft SQL Server Desktop Engine (MSDE database back-end to store data.