So I suspect in some kind of dumb way, Office was updating itself and screwed up? The last Windows update was May 12, the quality update for. This then let me start the installer I had downloaded, which is currently in progress for downloading (though, extremely slowly, despite a 19ms / 120Mbps connection - MS having issues I wonder? - 11:35 AM Eastern May 15 2020). old, (surprisingly it let me without hassle), and upon doing that, I then was able to kill the now-memory-only OfficeC2R exe file from Task Manager. I did the Open File Location, found the exe for this thing, renamed it with. It wouldn't end, it would just pop back up again in Task Manager (but again nothing in the actual UI). Task Manager shows some OfficeC2R stuff, which I tried to End Task. Running the installer, it tells me an installation is already in progress, yet there are no taskbar/notification area icons.

The only slight clue I have on this is that, given that it's gone, I decided to first just re-download the installer after logging into. The software is gone completely, nothing in Apps, except the generic Office Click to Run icon that's usually found on Win 10 machines whether Office was actually installed or not. Googling on this, most people focus on missing icons. No errors, nothing, the software is simply gone. A user under a Microsoft 365 Business Standard (formerly O365 Business Premium) license reported to me today that all Office 365 apps have disappeared from her Win 10 Pro computer.

Office 365 outlook icons disappered