If you've just upgraded to Outlook 2010 from an earlier version, expect to see some very big changes, most notably the ubiquity of the Ribbon interface. The Ribbon first made its appearance in Outlook 2007, but in a relatively minor way -- on the main Outlook screen there's no Ribbon, but when you open or compose an email, the Ribbon appears. Now it's everywhere.
There are other significant changes in Outlook 2010 compared to earlier versions, including integration with social media networks like Facebook and improved handling of threaded messages.
Whether you're coming to Outlook 2010 from Outlook 2003, 2007 or a different email client, we've got you covered. This cheat sheet shows you how to get around; it also explores features that are brand new in Outlook 2010.