Question : Revision history in Office 2007

Hey all, I thought one of the new features in Office 2007 was to be able to revert back to previous saves and versions of a file.

Example:
I created a file yesterday called test and saved it, and today i modified it and saved it again with the same filename..I want to revert back to yesterdays version.

How can I enable or check this feature? Is this also possible in Office 2003?

Thanks

Answer : Revision history in Office 2007

In Word 2003, you just do File, Versions, Save....