For many, summer is a time of transition: weddings, graduations, job interviews. And that means it's also a season for thank-you notes.

In today's world, e-mail has replaced snail mail as the preferred mode for much communication. But etiquette expert Peggy Post and Judy Gilbert, Google's director of staffing programs, both agree that a handwritten note is still the best way to say "thank you." They talk to Michele Norris about what's proper and what's not -- and offer advice on pitfalls to avoid.

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