Hi Rob,
In Word the 'font' named on the toolbar is the font the author used, even if that font is not available. With a document opened
that shows Calibri, check in Tools=>Options=>Compatibility\
and click the [Font Substitution] button to see if Windows is 'helping' fill a gap for a missing font with one available in Word
2003.
If you install the Office 2007 converter pack (for Office 2000, XP/2002 and 2003)
http://office.microsoft.com/search/redir.aspx?AssetID=DC102052461033
fromhttp://office.microsoft.com/downloadsit should add the core Office 2007 fonts, including Calibri, to your system.
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Is thier an add on font for Calibri - as it shows up in Word 2003 -
but as i stated before looks nothing like it - and it changes all the
formatting in my work.>>
--
Bob Buckland ?

MS Office System Products MVP
*Courtesy is not expensive and can pay big dividends*