If you elect to purchase Office 2007 I personally would uninstall the trial version first. As for Office 2003 I see no reason why it will not work with Vista... just be sure to download all the updates and any service packs.
Hope this helps.
I am new to this forum, and also new to Vista. I just bought a Gateway AMD Phenom(tm)9500 Quad-core Processer 2.20 GHz 3070 MB.
It came with Microsoft office 2007 pre installed as a 60 day trial version. I tried to install my 2003 Microsoft office and it worked, but did not let me send email from websites like craigslist. Should I just purchase the 2007 microsoft? and if so, I can get it cheaper than the trial version wants for it, so do I need to uninstall it to reinstall the purchased version? Or can I use my 2003 , and if so, do I uninstall the trial 2007? Thanks for any help.