How do I hide the email addresses I'm sending to on a message?

There are several other situations when it's right to use BCC. If you're sending something to a rather miscellaneous bunch of people who don't necessarily know each other or have any connection except via yourself, you protect each recipient's privacy. You prevent the use of indiscriminate reply-to-all that could be embarrassing to you or others (Reply-to-all does not extend to BCCs of the initial message). And you prevent your recipients' addresses being re-used or sold for commercial purposes.

When sending email in Outlook 2007, I do not want the recipients email address to show but I do want the recipients to know who all received the email. How do I do that?

@Jim
If I understand correctly what you want, you can send using BCC and include a list of the names in the body of the email.

This is a great tutorial for the newbies.

Leo,

Just a minor point. When I took typing in the mid 50's, CC: was also called Courtesy Copy. That was because we often had to send copies to more than just one person.