Question : compare emails

Using a built-in function, I want to turn the font in Column A red, if the email in Column A matches an email already in Column B.

They are all email addresses and there is nothing but header text that is in a different format.

Answer : compare emails

Use Conditional Formatting.  In Excel 2007/2010:

1) Select the cells in Col A you to apply this to

2) On the Home tab of the Ribbon, click Conditional FOrmatting | Manage RUles

3) Add a new rule, with rule type 'formula to determine format

4) Use a formula of

=COUNTIF(B:B,A2)>0    <assuming A2 is the first cell to be formatted>

and click Format to choose your formatting options
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