Hi. Performed a fully clean install of Windows 10x64 today followed by Office Pro x64 Insider Fast v1707 (Build 8316.1000).
I'm getting negative behavior from the ribbon if I install the "Microsoft Junk E-mail Reporting Add-in for Microsoft Outlook" add-in (I'm sourcing it from the link below).
When I enable the Junk Reporting add-in, the format of the "Delete" group on the ribbon changes, and the all-important "Archive" button disappears. Disabling the add-in restores normal appearance/functionality.
Below images - first is desired "normal" appearance including the 'Archive" button, second is what happens when I enable this (time-tested) add-in.
Hmmn..... ? Thanks/jim
Add-in source:
https://www.microsoft.com/en-us/download/details.aspx?id=18275