UBitMenu is a free addon which lets you add office 2003 classic file menu for free in office 2007, this addon is currently the only free way to add classic file menu on top of ribbon interface in windows. It does not hide the ribbon interface, it adds the classic menu on the top of it.
UBitMenu will help you save money during your Office 2007 / Office 2010 rollout. You can adapt to the new interface also with time and keep using the classic file menu also with the ribbon interface all the time.
Read Also: Remove ribbons and save space in office 2007