It's as easy as writing an email. Click here for the details. If you use Windows 95, you might have Microsoft's Internet Mail. Upgrading to MSOE is just a simple download. MSOE's address book is feature-laden, too.
Contacts can be categorized-business, personal, etc.
MSOE has an option to automatically place senders addresses in your book if you reply to the senders mail. No more worrying about clogging up your email. Or, use it for storing files offline, rather than on your hard drive. It's another free feature from Triton. In summary, MSOE is a powerful tool for managing email.