Basic Difference between MOSS 2007 and Sharepoint 2003

SharePoint Services is the foundation of SharePoint. SharePoint Services are a framework which provide the most-used features commonly associated with SharePoint, including lists, document repositories, SharePoint sites, and integration between SharePoint and Microsoft Office. SharePoint Services 3.0 are free and included with Windows Server 2003.

SharePoint Server, or MOSS 2007, is an additional product from Microsoft which layers on top of SharePoint Services and adds advanced features like the ability to search across SharePoint sites, Excel Services, Forms Server, and Business Data Catalog. While SharePoint Services is free, MOSS 2007 requires the purchase of licenses