You probably only have your .mac account in your address book. First quit iCal. Then, go to address book, double click your name (computer user) and select "edit." Add the email you want to have the alarm sent to and save. Reopen iCal and try setting the alarm again - your new email will appear. EDIT: Oh, i see you did that already. Are you sure you added your work email to your personal user account in address book?