Never ever consider about OpenOffice..or you'll witness further fall in the Staff Productivity!
Everyone will then have a decent time to relish a cup of Coffee till the document loads using OO, instead remain stick to Microsoft Office 2003.
One needs to have a 'Robust'* machine to run Office 2007 as optimally to that to 2003!
* Pentium 4 struggles with modern day Software Applications, Core2Duo & respective chipset are the pre-requisites nowadays!