Hi T.J.,
MS considers lateral moves within the same product series,
in this case Office 2003, to be cross-grades, rather than
upgrades.
Since Office 2003 Basic Edition is an OEM only (preinstall
on new PC) editions, rather than a retail store edition,
you may want to contact the PC provider as they often have
a tradeup program available for the Office copies they provide.
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I am trying to upgrade to Office Pro 2003 for Office Basic 2003. I need to
use Powerpoint and Access which did not come with 2003 Basic which was
installed in my computer new. >>
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Let us know if this helped you,
Bob Buckland ?

MS Office System Products MVP
*Courtesy is not expensive and can pay big dividends*
Office 2003 Editions explained
http://www.microsoft.com/uk/office/editions.mspx