Conditional Formatting in 2007 doesn't work after save to .xls

[sandeaj]

Hoping someone can help with this. I have created a simple conditional format whereby the text in one cell has white (invisible) text unless someone answers the question in another cell incorrectly, in which case the text turns red so the user can see it. This seems to work fine if I save the file as .xlsx and reopen in Excel 2007. However, if one of my teammates opens the file in Excel 2000 or 2003, the formatting doesn't work. I can look at the formatting rule and it appears like it should work, but it doesn't. I tried saving as Excel 97 - 2003 format, but then the formatting doesn't even work for me when I reopen in 2007. The weird thing is that if you open the file, see that the formatting isn't working, and then explicitely change the font in that cell to white (even though it already appears to be white), the formatting starts working.

I'm attaching a sample file and would appreciate any thoughts on how to get around this issue. (At least I think I attached the files?)

Thanks,

Mandy