OBA Application patterns describe the breadth of approaches that can be used to extend and integrate LOB systems and Microsoft Office. These application patterns in many cases are based on real-world implementations, and in other cases they are built on features and capabilities of Office 2007 that have a generalized solution rooted in input from customers and partners. Multiple patterns can and typically are combined in a single OBA, and more sophisticated patterns emerge within scenarios involving specific applications and industries.
Customers and ISVs can often implement these application patterns in Office 2003, although for just about every case, Microsoft Office 2007 and the latest release of Visual Studio Tools for Office makes implementing the application patterns simpler and offers richer possibilities.
Get the details at thisMSDNarticle. Note that This article is an excerpt from 7 Microsoft® Office Business Applications for Office SharePoint® Server 2007 , from Microsoft Press.