When composing or replying to an e-mail message in Outlook,
you can easily rearrange the names of the people receiving
the message by dragging their e-mail addresses between the
To, Cc, and Bcc address fields. Just select the name or names
you want to move and drag them into the destination field.
Note: If you have errant semicolons in the To, Cc,
or Bcc fields, you can remove all them by pressing ALT+K.