Plaxo

From the site:

"Plaxo, Inc. keeps people connected by solving the common and frustrating problem of out-of-date contact information. Founded in July 2001, Plaxo provides a free service that securely updates and maintains the information in your address book. Plaxo is the universal digital assistant; available to you wherever and whenever you need it to keep you organized, on top of your life and in touch with those you care about."

Plaxo
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