I need access to my online archive, which unfortunately doesn't work with the new Outlook, so I switched back to the old version. Also it's not possible to import ics files attached to mails and import them to an Exchange calendar.
What I am also missing are smart folders for unread and marked messages. I know I can filter in the message list view, but I would like to have distinct entries on the left navigation pane.
Another thing that made me go back is that it's not possible to add or edit categories to contacts.
Since this is a Mac app, PLEASE create a system level extension for sending mails from Safari and from the Finder. Also a today extension for the Mac today view and of course support system level notifications. I mean, how difficult is it to add this support? The Outlook notifications are awful and must integrate into the OS..