Using the message list and preview pane, you can view a list of messages and read individual messages at the same time. Multiple identities make it easy for you to keep work e-mail separate from personal e-mail, and also to keep individual users' e-mail separated. Each identity has unique e-mail folders and an individual Address Book. You can also create multiple users, or identities, for the same computer. If you have several e-mail or newsgroup accounts, you can work with all of them within one window.
