Use the button "Reply" to reply to an Email using a template.
It works exactly like the normal "Reply" button in outlook, except that the template you've selected will be automatically inserted into the text of the reply Email.
The reply will always be created for th Email which is currently selected in Outlook.
Use this button to quickly reply to an Email with a template.
That way you only need to click "Send" in the Email window and you're done.