Installing Office 2003 and Office 2007

[ls]

I have a new computer with Vista Home Premium, and I would like to install
both Office 2003 ad Office 2007, will it cause a problem to my computer? Any
problem when I am working in Excel in Office 2003 or Office 2007?

If I can install both versions, is there a particular order that I need to
go through? I am assuming I have to uninstall Office 2007 Trial version
before any new installation, correct?

Thanks!

 

[DL]

Uninstall any Trial together with activation assistant, reboot
Install 2003, run MS Update to install critical updates, after any reboot
run it again.
Then install 2007
Only a single instance of Outlook can be installed
You are aware that 2007 can both open & save docs in the old format?
So unless you have some other reason for installing 2003 it might seem
superfluous