If you create an event in the calendar component, you can then send invitations to the attendee list through the Ximian Evolution email tool. The invitation card is sent as an attachment in iCal format.
If you click on the attachment button and click the View Inline, Ximian Evolution will show you information about the meeting, and let you respond to the meeting in several ways. Select the response that you would like, and then click the OK button.
Your options are:
Select this entry if you will attend the meeting. When you click the OK button, the meeting will be entered into your calendar.
Select this entry if you will probably attend the meeting. When you click the OK button, the meeting will be entered into your calendar, but marked as tentative.
Select this item if you will be unable to attend the meeting. The meeting will not be entered into your calendar when you click the OK, although your response will be sent to the meeting host if you have checked the RSVP box.
Check this box if you would like your response sent to the meeting organizers.