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Office 2010 is overall very similar to Office 2007, but with a few changes:
"File" Tab: This replaces the Office Button, and clicking it brings you to "backstage view". Here's a video from Microsoft showing "Backstage View".
Watch these "getting started" videos for Word or Excel. They introduce the Ribbon and other changes. Then, use these interactive guides to see where items in the 2003 menus are now located in the ribbon.
Want to explore more? Visit Microsoft's Office Support pages.