Since its inception way back in 1989 (initially for Macs then for PC Windows in 1990), MS Office has been the premiere office assistant. With several different applications to be utilized, many whose work included using a computer happily incorporated it into their office routine. The updated version includes Microsoft Office 2007 Ribbon to Classic Toolbar and Menu of Office 2003. The ribbon links the previous versions of not only the classic toolbar itself but several of the most popular applications used in the MS Office 2003 version.
If you prefer using the Classic Menu for Office or the Classic Menu for Word this allows you to access them via the toolbar. Additionally, the Classic Menu for Excel along with the Classic Menu for PowerPoint are readily available as well. The ribbon or tabbed toolbar, which was incorporated into MS Office in 2006, requires Service Pack 1 or higher to work with the 2003 version of this popular set of utilities.
Currently, the Windows version of Office 2007 (Office 12.0) which was released on January 30, 2007, is the most recent. An update will be out sometime in 2010. Microsoft offers a compatibility pack which allows MS Office versions from 2000 to 2003 the ability to open, save, and as well as edit documents that have been created by use of the newer formats of Office 2007.