Using New Outlook on Windows for personal email, calendar, and contact management
Another poorly planned change by MS programmers. When Ford makes a new car they do not throw out everything and go back to a horse and cart. For a program to be useful the designer should look a what is being used already and improve on that not create a new format that leaves things out and do a patch up later to return those missing things. What has MS learnt over the years? Obviously not to see what its customers want.
But that's the whole thing; It showed that continuing with the current concept (Classic Outlook) wasn't going anywhere anymore in relation to modern software development and being able to deliver new features or improve on existing ones. You can fix and upgrade your car all you want, but at a certain time, you just need a new one (to stay with the imperfect car analogy).
I'm quite sure Ford started with a blank page and a new chassis when they went from a car with a combustion engine to fully electric. It's more like that; Starting over with a new framework. They then indeed re-add what was being used already and improve on that where needed/possible and added new features as well. But just like with a car, even when the look or function of the parts are the same, they might need to be redesigned to fit on the new chassis or work with the new engine. That is the stage New Outlook is currently in; Quite a few parts are still on the drawing table or still on a backlog.
As mentioned before in this thread, New Outlook is currently an opt-in when you are a Classic Outlook user. It is only there to show what's next for Outlook. This isn't a finished product yet (nowhere near even!), and it isn't advertised as such either. Some people and organizations might be able to use it as their daily driver already (or are attempting to) but this isn't true for the large majority. You can try it if you're curious, but you certainly don't have to.
See it as an "Advanced Preview" and nothing more. It's the not fully functional car that is shown at a car convention a few years before its actual release. When that happens, the opt-in for New Outlook becomes an opt-out but even then, Classic Outlook will remain "road legal" until at least 2029.
To end with another imperfect analogy; Rome wasn't built in a day...