Office 2007

[eumac]

Are ther any issue's that I should be aware of when installing Office 2007
onto a computer that already has Office 2003 installed?

 

[mezzodiva]

Given such a broad question, I'd say no. If you ever want to revert back to
Office 2003, you will want to locate your installation media and product key
for it.

 

[Srikanth]

while installing office 2007 if u click "upgrade" option.
Office 2007 setup may uninstall your off 2003.