Plaxo is a free contact management service that helps you keep your email address books updated and in sync with one another. Additionally, it can also synchronise your calendar, notes and tasks so that they are available wherever you go. I have been using it for the last few years primarily to keep my home and work copies of Outlook synchronised, but I also find it increbibly useful as a backup tool for if my computer crashes, and for making sure that I have the most up to date information from for my contacts.

Until recently it only allowed for syncing between Outlook and Outlook Express on Windows machines (although there is a web based version as well), but at last they have now begun to expand their support for other platforms such as Mozilla Thunderbird, Yahoo & AOL/AIM which means that a significantly broader user base can now connect to the service.

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