Hello from the Office 365 Groups Engineering Team

Antony - We are working on adding Soft Delete capability for Office365 Groups and this should be available soon. Ove - You can set "-CalendarMemberReadOnly" property on the group that will give only read access to members and they cannot delete any events. Please see the details on how you can do this at https://technet.microsoft.com/library/mt238274(v=exchg.160).aspx . Gregory - The naming policy feature is currently available only for groups created from Exchange endpoints (i.e. OWA & Outlook). We are working on adding this capability across all workloads like Planner etc.