As far as I know, these downloads started with Office 2007 and Windows Vista ... have never seen, nor could I find, 2003. You might consider calling some local PC shops to see if they have a CD you can buy, rent, or borrow.  Local school or business IT departments may be places to check with too.
Hi, Is there a Digital River download for Office 2003 Professional? Found Service Packs but cannot find Office.  Have the Product key,  all we need is the download. Thanks
Microsoft Office 2003 download