SkipVought,
This type of question has been plaguing me for quite some time. I found a round about answer by using the Conditional Formatting embedded in a Macro.
I can't see how the cammand above will turn the Cell Red. It would be nice to have formula driven conditional formatting but to date I haven't found a way.
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Occam's Razor - All things being equal, the simplest solution is the right one.