have the shop inform the customer when change the status of order to cancelled?

Hi,

When you change the status of an order in the backend, you have a checkbox/option you can check/activate to notify the customer.
If you want that checkbox/option to be checked/activated automatically, you can do as explained here:
www.hikashop.com/forum/4-how-to/15676-se...-default.html#162679
Now if you want to have the checkbox/option checked/activated only when the status is changed to "cancelled" and not for other order status changes, that would require a bit more code changes in the view files pointed by my message on that other thread.