In Outlook 2007, you can add multiple email addresses in the “To:” field when composing emails. Depending on whether you have those users in your address book, you may just be able to start typing the recipients’ names and their email addresses will pop up. If you’d like an email to go to another person, but not have the original recipient see that someone else is included, you can use the “Bcc” field (the “Cc” field will copy the recipient and show their name/address to all recipients).
Often if you are sending email to a group of people who do not know one another and would not appreciate having their email addresses shared, you might want to use the Bcc field for all recipients, and just include your own address in the “To” field. That way, all recipients will only see your email address and not anyone else’s.