TRUE and FALSE are distinct boolean values that Excel understands and can
calculate with. Like if you enter 5 then Excel assumes that you want the
numeric value 5 and not the character 5. A qualified guess, and the outcome
of guesses are sometimes not what the user wants.
But why on earth would any user want a spreadsheet cell saying true ? It's
not even a boolean value, just four letters lining up. Word stuff.
HTH. Best wishes Harald