New feedback from Outlook.com
The New Outlook is difficult to use. Old address book information has been lost. An attempt to add a new, different address with a name similar to an old name and address are merged. I had to try various things to trick the address book to prevent the merging. That effort took 45 minutes.
The Inbox is harder to read. At least for my 72-year-old eyes. No doubt the developer has young eyes and can pooh-pooh this statement. But those 20-something eyes will become 72-year-old eyes in half a century (provided those eyes belong to a person who will be fortunate enough to live that long).