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Hi Dana, Expires headers and other caching headers can help improve site performance (as you said), and that will be a good thing for SEO. There is no reason to be concerned - they are common headers and there isn't much they could do to have any negative impact on SEO. Good luck! Tom

Paul, Thank you! Yes, I realized I could use the Moz bar to highlight the links that were followed and no followed and came to the same conclusion. Thanks for your insight! Dana