The BCC stands for blind carbon copy, which allows the sender of a message to hide the person entered in the Bcc field from the other recipients to whom the mail is sent.
In Outlook, Bcc is usually not visible in the e-mail message window and you need to add Bcc filed. By default, the Bcc field is turned off and needs to be turned on in case you want to add any person in Bcc.
Steps to Add Bcc in Outlook 2007
Step 1: Open Microsoft Outlook 2007 on your computer and click on “New” option on the top menu bar.
Step 3: To add “bcc“, select the “Show Bcc” ribbon on the top of the screen as shown in the image.