Hi Greg,
Yes, you can use
http://officeupdate.com for downloading updates to your Office 2003 Edition. There is one 'critical update'
already released that should show up as 'needed' when you visit the site with Office 2003 installed or use the Check for Updates
choice in the Help menu of an Office System 2003 application.
=========
I recently purchased Microsoft Office Professional 2003
(Academic Version)- RETAIL. Will I be able to run updates
on this application? >>
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I hope this helps you,
Bob Buckland ?

MS Office System Products MVP
*Courtesy is not expensive and can pay big dividends*
U.S.: MS Sweepstakes & Office 2003 Contest/Trial Software
http://microsoftofficecontest.com
Office 2003 explained
http://microsoft.com/uk/office/editions.asp