Step 1: Shift to the Calendar view, and open the meeting that you will send meeting update to one attendee only, and update your meeting as well.
Step 2: In the Meeting window, click the To button.
Step 3: In the coming Select Attendees and Resources dialog box, find out and select the attendee that you will send update to, click the Required -> button, then click the OK button.
Note: If you can remember the attendee’s email address clearly, please skip the Step 2 and Step 3, and just enter the attendee’s email address into the To field directly.
Step 4: Now you get back to the Meeting window, click the Send Update button.
Step 5: In the popping up Send Update to Attendees dialog box, check the option of Send updates only to added or deleted attendees, and click the OK button.
Note: Even if the new added attendee is included in the primary attendees that you sent to meeting invitation for the first time, the duplicate attendees will be removed automatically after sending the meeting update.