You must create the meeting within the primary calendar for tracking to work. If the meeting was created in a secondary calendar of any account (and not the primary calendar), tracking of attendee information will not be available.The only option the organizer of the meeting has is to save the email notification received for each attendee. There is no way to view (date/time) when an attendee responded.If you are an attendee, you will also have the ability to view the responses of other attendees using the instructions below.Any other user who has been granted full calendar details to the organizer's calendar will be able to view the status of attendees within any event.You can also see who has not yet responded. As a meeting organizer, you can find out which attendees have accepted or declined your meeting request. When you create a meeting and invite people, you are a meeting organizer.