Somehow I have managed to get quite possibly several hundred duplicate entries in my address book--most likely when synching my phone. I started manually deleting them, but found myself extraordinarily frustrated. I use Plaxo, so I've synched the address book to the online service and I've upgraded my account simply to use the de-duper.

Plaxo can install a tool into Outlook that flags if a person is in your contact list or not and if they are a Plaxo member. If they aren't you can click on a link in the top right corner of your email window and in a couple of clicks add them to your contact list and allows you to immediately request an update from your contact.

Plaxo toolbars can be installed into Outlook, Outlook Express, Internet Explorer, MacOS X address book, Thunderbird, and onto your mobile phone.

There is a free limited version of the software.

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Plaxo is a utility that allows you to synch a variety of different address books. For example, my address book at work is in Outlook but at home is in MacOS X Address Book. Plaxo will link to both and give a merged online list that you can access anywhere.

Plaxo will allow you to send reminders to your contacts to update your address book. It will also send birthday wishes to those who have provided a date of birth.

It is incredibly difficult to keep in contact with friends, family, and business contacts. When you have a large address book it becomes nearly impossible. Plaxo makes the effort quite a bit easier.