Good objective piece by AMR Research on Office System 2007 :
AMR Research reports that the 2007 Microsoft® Office system is evolving into a platform for building and extending business applications, making vital business processes more relevant and accessible to more people. Most directly acknowledging this trend is Microsoft’s Office Business Application (OBA) Services, denoting platform-level enhancements, such as workflow, enterprise search, XML file formats, security, and the new extensible UI. This allows Office Client and Server products—as well as products from other independent software providers—to serve and support business intelligence (BI), communications and collaboration, and enterprise content management (ECM) needs for enterprises.
My favorite quote from the article :
SharePoint’s feasibility as a document management platform has improved exponentially in this third release. Unlike any software vendor we know, Microsoft knows how to use its massive audience to build more capable and satisfactory products over time.
Source and download : Microsoft.com