You can download trial versions of Office 2007 programs from the Microsoft website. They work as the full version for 60 or 90 days, in which time you can play with the charts and other features to work out whether they're worthwhile.That said, as the previous poster mentioned, you can make a effective and compelling presentation with just a flipchart or without any visual aids.The additional features in Office 2007 are generally enhancements for ease of use and refinements of the tools for handling complex documents. For assessment presentations, you're not going to be dealing with large datasets or taking advantage of those features.Rather than spending time to learn the new Office 2007 interface, you'll be better off to spend the time rehearsing your presentation and fitting it to the time allowed.