If you want to compose a new message in windows mail follow this procedure
1)In Windows Mail, click the Create Mail icon. The New Message window will appear.
2)In the To field, type in the email address of the appropriate recipient (this is the address of the person you want to send the message to).
3)In the Subject field, type in a few short words describing the purpose of the message.
Although this is not required, adding a subject is good practice.
4)Type your message in the large box that appears under the subject line.
5)When you’re ready click the Send button in the top corner.