The new user interface (UI), officially known as Fluent User Interface, has been implemented in the core Microsoft Office applications:Word, Excel, PowerPoint, Access, and in the item inspector used to create or edit individual items in Outlook. These applications have been selected for the UI overhaul because they center around document authoring. The rest of the applications in the suite will also be upgraded to the new UI in subsequent versions. The default font used in this edition is Calibri. Original prototypes of the new user interface were revealed at MIX 2008 in Las Vegas.