I would connect an external calenderservice, for example fruux.com, to my zimbra calender.
For sure its posible to connect an external calender in ZCS 8.0.6 but its only posible with an emailadress for "username" .
The service fruux only will give you a username and password you have to connect to. Its a normal CalDAV calender there.
We tried some other services, but no one gave us a emailaddy as username.
Did somebody try this ?
Thx a lot for ideas