Office 2003 will work with Win 7 just as well as with Vista or XP. I have been using with Win 7 64 bit for over a year and have not experienced any issues.
Office 2003 will work on Windows 7. Actually, up until recently, I was using Office 2003 and I realized that the spell check is completely outdated when it comes to words that have been recently added to the American lexicon. So keep that in mind that you are dealing with software nearly a decade old.
Be advised ..... I have twice rec'd calls from Office Managers who are dealing with employee revolts ..... over the 2003 -> 2007 MS Office "upgrade".
Quelled the revolt by suggesting they download open office which also makes the office bean counter happy
Thanks for reminding me about Open Office. This would be a good time to give it a try. I have had Open office for several years, but have not done anything with it.