I see..I'll inform my admin on that. Do the mail server also have to be version 9 too? We have an application server and a separate mail server.
Also, how easy is it to achieve what I wanted? (...including a button and a viewpanel in my mail in which the viewpanel is for user to select documents and the button will approve the documents when clicked..). Is it just creating a separate xpage with the thing I wanted and select this xpage in the HTML URL part? I've read a bit and the Gadget URL part I assume can be ignored if I don't plan to use them. But what about the Format part? I'm selecting JSON but where do I put this JSON code then? (I'm still learning about JSON though)