By default, DEX starts up with a Microsoft Office type ribbon menu.

The Ribbon is a contextual interface that offers functionality based on the context the user in working in. The Ribbon GUI provides the user interface of an application with a large toolbar filled with graphical representations of control elements which are grouped by different functionality. The Ribbon can also contain tabs to expose different sets of control elements eliminating the need for a lot of different icon based toolbars. Microsoft originally implemented ribbons as part of its "Fluent User Interface" in Office 2007.

In previous releases of AutoTRAX, people used a system of menus, toolbars, task panes, and dialog boxes to get their work done. This system worked well when the applications had a limited number of commands. Now that DEX can do so much more, the menus and toolbars system do not work as well. Too many program features are too hard for many users to find. For this reason, the overriding design goal for the DEX Fluent user interface is to make it easier for people to find and use the full range of features these applications provide. In addition, we wanted to preserve an uncluttered workspace that reduces distraction for users so they can spend more time and energy focused on their work. With these goals in mind, we developed a results-oriented approach that makes it much easier to produce great results using DEX.

In the Office Fluent UI the traditional menus and toolbars have been replaced by the Ribbon — a device that presents commands organized into a set of tabs. The tabs on the Ribbon display the commands that are most relevant for each of the task areas in the applications. For example, in Office Word 2007, the tabs group commands for activities such as inserting objects like pictures and tables, doing page layout, working with references, doing mailings, and reviewing. The Home tab provides easy access to the most frequently used commands. Office Excel 2007 has a similar set of tabs that make sense for spreadsheet work including tabs for working with formulas, managing data, and reviewing. These tabs simplify accessing application features because they organize the commands in a way that corresponds directly to the tasks people perform in these applications

The Microsoft Office button

Many of the most valuable features in previous versions of Microsoft Office were not about the document authoring experience at all. Instead, they were about all the things you can do with a document: share it, protect it, print it, publish it, and send it. In spite of that, previous releases of the Microsoft Office applications lacked a single central location where a user can see all of these capabilities in one place. File-level features were mixed in with authoring features.

The Office Fluent user interface brings together the capabilities of the Microsoft Office system into a single entry point in the UI: the Microsoft Office Button. This offers two major advantages. First, it helps users find these valuable features. Second, it simplifies the core authoring scenarios by allowing the Ribbon to focus on creating great documents.

Reaction to interface

At the introduction of the Ribbon interface in Microsoft Office the reception of the Ribbon GUI by users and experts was mixed. Generally it was seen as an improvement especially for new users. For advanced and power users, the adjustment may have been a bit more disconcerting, at least initially.