Compatibility issues Excel 07 vs 03

Hi,


I've made 4 different models in Excel (in 2007 version of Excel). I've checked them with the compatibility check built-in the 2007 version of Excel, before saving to Excel 98-2003 version.

However some of my models still has some issues with Excel 2003.

One model contains a VBA macro, is it then the Macro that is not compatible if the Excel built-in compatibility check says there are no errors?

Is there a way to install Excel 2003 on the machine in addition to Excel 2008, so that I can run them in both version to test frist hand? At the moment, I've no option to test the Excel models on my own or any computer in the office, as everyone is using Excel 2007.