We still use on-prem Exchange with Microsoft Office at work, and it's really becoming a problem. Microsoft already auto adds shortcuts for 365 (which we don't use and doesn't work with our setup), and the "Mail" app (which also doesn't work with out setup), and now I have to explain to people to use the regularly titled Outlook icon and not the "Outlook (new)" icon (which again, won't work with our setup).
The FAA might have something to say about it.