Add an Office 365 Group Calendar to your Outlook Calendar
You should be able to add an Office 365 Group Calendar to your Outlook Calendar. Currently I cannot use the group calendar in Outlook, and many users prefer to be able to use both Outlook and Office 365.
Duncan Ricks commented
It would be great if all the group features (OneDrive, Calendars, etc) that are available in cached mode in Outlook client were also available in online mode. Our school cannot enable cached mode for several reasons but its a real shame we can't use these awesome features in the client and have to switch to OWA
Michiel Van Den Broek commented
Also, open the group calendar on a smartphone in the default calendar app (so I can put it next to my personal calendar)