Autorisation problem to share a calender

Hi, I want to share an outlook callendar registred on an gmail account, the button share callender is not available and when i open the settings of the gmail callender account on outlook I get the message: Delte kalender støttes ikke for den valgte kontoen" wich means : "shares calenders  is not supported by this choosen account". Is it possible to share a callendar from a gmail account?

regards 

Sam