Event handling for Appointment Custom form in Outlook

When you are working on the Appointment custom form in Outlook, you can use the following Events of the appointment item in your custom form’s script.
 
Open:
This event is called before displaying an appointment item.
 
Read:
This event is called when the user selects the appointment for editing.
 
Write:
This event is called before writing the appointment item when user has tabbed off the appointment item in a view. let’s say when you click on ‘Save and Close’ button’ this event will be called before Item_Close() event.
 
Close:
This event is called before closing the item inspector. Means when user click on ‘Save and Close’ or ‘Close’ button for closing an appointment, this event will be called.
 
Send:
This event is called before an appointment item is sent by user and before item’s inspector is closed.
 
Reply:
This event is called when user reply to the sender of an appointment item.
 
ReplyAll:
This event is called when user reply to the all recipients of an appointment item.
 
Forward:
This event is called when user forward an item.
 
BeforeCheckNames:
This event is called when user does a check names on an item.
 
AttachmentAdd:
This event is called when user insert an attachment into appointment item.
 
AttachmentRead:
This event is called when an attachment is opened.
 
BeforeAttachmentSave:
This event is called before saving an attachment.
 
BeforeDelete:
This event is called when user delete an item.
 
PropertyChange:
This event is called when a standard Outlook property changes on an item.
 
CustomPropertyChange:
This event is called when a user property changes on an item
 
CustomAction:
This event is called when an action is selected by the user.