Built for today, designed for the future - The new Outlook for Windows is ready when you are

There is a Reddit post listing the feature differences between the new and Classic Outlooks. List of new features and missing features in the "New" Outlook : r/sysadmin (reddit.com)

"Outlook was released over 25 years ago at a time when there was fierce competition in the email client space. Over the years, Microsoft stole every good idea from the competition, incorporated customer's requests, and continually refined the client. This resulted in Outlook becoming the most capable/powerful email client available. Now, that Microsoft owns this space and there is no real competition, they are scrapping it for a v1.0 product."

The new Outlook has 5-10 new features, but it is missing hundreds upon hundreds of features that "classic" Outlook contains. Many are minor things that no-one will miss, but some are major features such as PST and MAPI support.

If just a single employee needs one of those important missing features, then a company cannot standardize on the new Outlook. It is therefore, not ready for enterprise use.

I find this funny:  "expect the new Outlook to reduce support tickets up to 65%"

Yes, this makes sense when you remove 65% of the features.

I expect the new Outlook to increase support tickets. We will have to support both Outlook versions for awhile, and as people try the new one, we will receive hundreds of support calls about missing features (just like we did during the preview period).