receiving one or more invitations to one or more events from at least one sender;

marking the received invitations as either accepted or declined;

sending a status message to the invitation sender for the received invitation, indicating an accepted or declined invitation status;

displaying the accepted invitations on the recipient calendar as accepted events in corresponding event time slots;

displaying the declined invitations on the recipient calendar, within the grid, as declined events in corresponding event time slots, where the displayed declined events differentiate in format from a format of the accepted events by one or more of displaying the declined events on the calendar in a different color, automatically inserting and displaying a keyword “DECLINED” in a subject line, displaying a subject line of declined events indented from a subject line of accepted events in the same time slot, displaying a different icon in front of the calendar event time slot when the event has been declined, and/or configuring the declined events with various font formats; and,

recalling a previously declined event for acceptance by opening the declined event displayed on the recipient calendar grid, changing the status of the declined event from declined to accepted, and sending an updated status message to the sender indicating that a previously declined event has now been accepted.