Equation Editor is included on your Office 2003 CD, but it is not
installed by default. You can add the feature to your installation by
inserting the CD and clicking on Start | Control Panel | Add/Remove
Programs | Microsoft Office 2003 | Change | Add/Remove Features. You'll
find Equation Editor in the "Office Tools" category.

MKR wrote:

I have the lastest version of Office Professional and have downloaded the
latest updates, but still missing equation editor in Word. Any other ways to
get it?