The majority of Outlook users have only a single address book. This is all that most people need, in fact. In some situations, you may have two or more address books. This can happen if you create more than one Outlook data file. Each data file will have its own address book, and you will have access to the one in whichever Outlook data file is open. You might want to use more than one Outlook data file if you want to keep your personal e-mail completely separate from your work e-mail.

Another situation in which you will have more than one address book is when you have both a regular (that is, SMTP/POP) e-mail account and a Microsoft Exchange account set up in Outlook. The regular account will have its own address book and the Exchange account will have another, separate one. You will have both available to you at the same time in Outlook; they are listed at the top of the Navigation pane when Contacts are active, and you can choose to view one or the other. When you add a contact, it is added to whichever address book is active.

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