Microsoft SharePoint Portal Server
"Previously code-named "Tahoe," SharePoint Portal Server is the flexible total portal solution that lets you easily find, share, and publish information. The new server provides knowledge management—seamlessly integrating with the Microsoft Office and Microsoft Windows® productivity desktop environment. This integration helps you work robust document management, search, subscriptions, and in-line discussions into your document management and collaboration processes. In addition, with an architecture built on extensible Web Part technology, SharePoint Portal Server offers your enterprise the most effective way to both build and extend intranet portals."