Personally, I use Excel 2003 at work and Excel 2007 at home. I am constantly (as in 3 or 4 times a weeks) using Excel 2003 files in Excel 2007.
I found this tip at vista4beginners.com showing how to have Office 2007 automatically have files in the Office 2003 format: Configure Microsoft Office 2007 to save files using the old Office 97-2003 format
Tags: file format
I just upgraded to 2007. This will help thanks
Not sure if it’s any use after all this time, but you can get an addon to open 2007 file formats in 2003 now