According to Forrester Research, companies migrating to Microsoft Office 2007 are experiencing "more intense" training experiences than they had expected. Microsoft radically changed the user interface in key Office applications such as Word, Excel, Access, PowerPoint, and, to a lesser degree, Outlook, in Office 2007, the first time the Office UI has been changed demonstrably since the suite was first introduced over a decade ago. Microsoft says that the new UI is more intuitive and exposes more functionality in a discoverable way than did older Office UIs.
Office 2007's user interface is based around a context-sensitive visual feature called the Ribbon that exposes functionality that is relevant to the task at hand. For example, when you're editing text in Microsoft Word 2007, the Home tab in the Ribbon displays options for fonts, paragraphs, styles, and editing. But when an image is inserted in the document, a new Picture Tools - Format tab appears, with options related to pictures.