Sometimes, it's good to copy people but hide their addresses from the message — when you send to a group whose members do not know each other (and each other's email addresses), for example, or when you mail a group that does know each other and always uses Reply to All instead of Reply to send a message that's only for you.
Add Bcc Recipients in Windows Live Mail
To add Bcc: recipients to an email you are composing in Windows Live Mail:
- Start with a new email in Windows Live Mail.
- Click Show Cc & Bcc if you see it next to the Subject: field.
- Use the Bcc: field like you would use the To: field.