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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