It's absurd that we can't open O356 Group calendars in the Outlook app for Android. It's such a trivial feature to be missing from the app, and it makes the app less useful as I can't see all of my calendar events.
This is becoming a serious problem for some of my users as well. People in HR are accidentally emailing stuff to employee's personal address instead of their company address because of this.
To clarify this a bit further... it no longer seems possible to remove entries from the "Suggestions" that show up when you start typing a name in the "To" field of a message. The "X" that every piece of documentation tells you to use does not appear next to the entry. Clearing AutoComplete cache doesn't have any effect.
This has become a serious problem for some of my users, as they are accidentally emailing personal addresses instead of company addresses.