Responding to Meeting Requests
Just as you can send meeting requests, other people can send them to you. When you receive a meeting request, you can respond in one of four ways:
You can accept the request and inform the requester that you will attend. Meetings that you accept are automatically entered in your Calendar.
You can tentatively accept a request, indicating that you might be able to attend the meeting. Meetings that you accept tentatively are also entered in your Calendar, but your free/busy information will show you as only tentatively scheduled for that time.
You can propose a new meeting time, in which case the request is referred to the meeting organizer for confirmation. Your Calendar shows the proposed new meeting time as tentatively ...