Under Outlook Online you can add personal calendars (so they're merged in the view with your work calendars) from under Add calendar -> Add Personal calendars. Great idea! However, when you try to add a Google calendar these are the required permissions:
This is a complete no-go for me: I'd like to display my personal calendar in Outlook. I don't even want to edit it. But I could kind of accept calendar permissions. But why on earth does Outlook need permission to have complete control over my e-mails? My Drive? My contacts?
Can this be changed?
This would be crucial because it seems that currently there is simply no way to have a single calendar view of all events in your personal work (Outlook), group work (Office Groups) and personal private (Google) calendars in a single view: Due to this you can't view Google Calendar events in Office, and due to this issue it's not possible to show group calendar events in Google Calendar.