Configuration of NAV 2017 for using Office Products

Hello,
we have a fresh NAV 2017 Installation and we want to connect to several Office products like Word and OneNote.

1.) When ever we start a bulk letter out of NAV, we get no response from Word. If you click on Word icon we got an empty bulk letter.
2.) I filled in our Server path for OneNote. There is our company notebook. Of course all users can open it without NAV. All buttons and icons are inactive.

I'm very new to NAV, so i would be glad to get a hint.

Thanks a lot,

joerg