If you're upgrading from Outlook Express, Windows Mail can import your existing account information and e-mail addresses. ...

If you're upgrading from
Outlook Express, Windows Mail can import your existing account information and
e-mail addresses. The first time you start Windows Mail, you will be prompted
to set up an e-mail account. If you skip this step and want to set up a new
account later, click the Tools menu, click Accounts, and then click Add.