Outlook

Show multiple calendars at once, in an overlay or side-by-side (split) view to assist with managing my calendar, people, or groups calendars

The navigation bar comes with Groups and actions. And, if the groups are not to your liking, you can create or reposition them.

Meeting organizers can automatically delete forwarded calendar event notifications to save storage space and email handling.

Start embracing the Navigation Toolbar moving from the bottom to the left folder pane in Outlook Windows. It will become the default soon.