Hi David,
If you're looking at retail copies then purchasing
another boxed set/license is the basic method.
If you need 5 or more MS product licenses then
the MS Open License program may be of interest
http://microsoft.com/licensing .
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How do I obtain additional licenses for my copy of Office 2003 please >>
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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