This product has been out there for some time now and appears
to me to be a good replacement for Outlook Express. It is well documented at
this site and you can download it from this web site.

About upgrading to Windows Live Mail
Windows Live Mail is the successor to Microsoft Outlook Express 6, Windows
Mail, and Windows Live Mail desktop Beta. 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 address
book (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, Windows Live Mail uses the contacts list associated with your Windows
Live ID.) 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 Windows Live Mail.) in
Windows Live 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 Windows Live Mail on the computer. If you upgrade to Windows Live Mail
from 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.
When you first open the application, use F1 (Help)
Left click on Tools, select Account(s) and set them the same as in Outlook
Express.
Left click on File, select Import Addresses and Messages.
Left click on View, select Layout and set as shown below for your best
security. (The other Layout options are OK as set by default)

Test the new application by sending a message to yourself and be sure you
can receive it as well
Most of the materiel we have covered for Outlook Express 69 to 137 also
apply to Windows Live Mail