how to get "updated:" in the subject line of changed appointments
 

We have users in our office who use Office 2003. If they schedule an
appointment, then change anything, the invitees get an email with the word
"Updated:" in the subject line. When our Office 2007 users create and modify
the appointment, the subject line is not modified.

Is this by design? Is there a way to have Office 2007 include "Updated:" in
the subject line?