: Check for a bright orange sticker on the original CD jewel case or the bottom/side of your computer if the software was pre-installed (OEM). Activation in 2026: What Still Works?

You need a product key for Office 2003 to:

If you have the original media, the key is typically found on a yellow sticker inside the CD case or on the Certificate of Authenticity (COA) attached to the computer if it was pre-installed .