When you send an email in Outlook.com, carbon copy it to other recipients. To carbon copy other recipients without revealing names and addresses to others who receive the message, such as when you're sending an email to a group whose members don't know each other, use blind carbon copy instead. Also, use Bcc to prevent recipients from using a reply-all tool to send their replies to the entire group, when only you should receive those replies.

To add Cc or Bcc recipients to an email you compose on Outlook.com:

In the new message, select Bcc to add the Bcc field to the message header. Or select Cc to add the Cc field.

Enter the recipients' email addresses in the copy fields provided.