About installing Windows Live Mail
If you have Microsoft Outlook Express 6, Windows Mail, or Windows Live Mail desktop beta installed on your computer, when you install Windows Live Mail, all of your existing accounts, settings, and e-mail messages are automatically imported into Windows Live Mail. Any contacts in your Microsoft Windows contact list (A list of contacts that contains the names, addresses, phone numbers, and e-mail addresses of each of your contacts. If you're signed in with a Windows Live ID, Mail uses the contact list associated with your Windows Live ID.) , and any Windows Calendar events (A scheduled activity that you enter into a calendar, such as a meeting, party, or appointment.) are also imported when you install Windows Live Mail.
You can't create Microsoft Outlook Express e-mail identities (A method used in Outlook Express that allows multiple people sharing the same computer to keep their e-mail separate. Identities aren't used in Mail.) in Mail. Instead, to protect each user's e-mail with a password, create a separate Windows user account and password for each person who wants to use Mail on the computer. If you install Windows Live Mail and previously had an Outlook Express account that contains multiple e-mail identities, you can import the e-mail messages and account information from the identities by clicking Identities on the Windows Live Mail File menu.