The Outlook Team, thank you for your reply.
The buttons for 'From, To, Cc and Bcc' aren't the issue, it the lack of the previous entry field boxes which makes the page look so amateur. Also the frameless edges to whatever you call the area in which you write the message need to be restored.
The whole thing looks cheap and nasty compared with Outlook 2007.
Also when viewing an individual e-mail, why are the 'reply, reply all, forward' response options shown in boxes just above the date as well as in the ribbon? Previously those boxes were only shown (on the left, rather than the right) when an e-mail was viewed in preview. They are unnecessary clutter when viewing an e-mail and should be deleted.
I've got used to the 'Win10' style icons now, although I still think that they look childish. But other than the option to use a 'simplified ribbon', I cannot find any other benefits of the recent 'up'grade.
Please think again and restore the previous version!