Outlook 2007 Looks Like 2003?!?

[dinogami]

Hi! - For several days now, whenever I launch Outlook 2007, it basically launches Outlook 2003 -- same old toolbars at the top, no Office button, etc. -- none of the new ribbons that Office 2007 has. Other Office programs (e.g., Word, PowerPoint) do not have this problem, and all Office products were installed on my computer simultaneously. This is a new machine that has never had Office 2003 installed on it. Outlook has not had this problem in the past; it is something new that has cropped up in just the last few days. Office diagnostics turn up nothing. I am not sure if I have inadvertently turned something off...? Any help that anyone can provide would be greatly appreciated! Many thanks in advance for your time and help!