Hi Julie,
There has been an Office 'Professional Edition' in each release
of MS Office starting with MS Office v4 (1994). You'd need to
know if the non-2003 edition is Office 97, 2000, XP(2002) but
the information here may be helpful to you.
http://microsoft.com/office/previous
The 'Professional' editions generally include word processing,
email/scheduling, spreadsheet, database, presentation software.
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What is the different between Office Pro and Office Pro 2003 >>
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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