SharePoint can pull data from external databases and other data sources

Web Parts and Web Part architecture (available to your SharePoint development by way of FrontPage 2003 or ASP.NET) can become a powerful component of your SharePoint sites. In particular, Data View Web Parts allow you to add views to your sites from a variety of data sources. You can create views specific to your SharePoint sites and link views together. Data sources can be databases, Web services, or any XML source (InfoPath documents, etc.).