BlackBerry :: Adding Calendar Appointments Using Invite Attendee Feature?

My husband has a Pearl Flip and I have a Curve 3G we are trying to add calendar appointments on both of our phones using the 'invite attendee' feature. When my husband creates an appointment he just invitee's me and the appointment shows up on my calendar, however, when I invite my husband to a calendar appointment he gets an email with the subject line stating the appointment name but nothing else (no time or date, just the name) and no appointment shows up on his calendar.