Open the appointment, task, or reminder note.
Click or on the toolbar.
(Optional) Type a message in the field.
By default, the sender can view your comment by viewing the item properties in the Sent Items folder. However, for a more noticeable indication when someone declines an item, the sender can select to receive a notification, as described in Receiving Notifications about All Items You Send.
(Optional) Select the calendar where you want the message displayed.
Click (or ) to close the window
If the calendar item is set as a recurring event, you are prompted to accept/decline all events or just this event.
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