After a restart and re-install of he iCloud for Windows, unchecking the mail completely and waiting a few seconds, the connection process worked, the TAB appeared in Outlook2016 and all works fine after some fine toning. I run an update of Office from inside my Outlook 2016. A step that was just not happening, was the connection of the iCloud mail, contacts, calendar, etc eve though the iCloud for Windows would run 'successfully'. It took 5 app specific passwords and as many installed on the iCloud for Windows app. I finally got my PC running WIN 10 to sync Outlook 2016 and iCloud.