A Microsoft file hosting and synchronization service.
I just had the same issue:
Luckily no work data. I had a game - dwarf fortress - on my Desktop. OneDrive already caused issue than, that I had to fix with chkdsk (**** microsoft?). So i moved it into C:\Games. All was well for a few weeks, and all of a sudden, all folders are empty. Some files - but not all - that had been created after moving it, are there. So are all the folders. But anything that was moved there from the desktop is just gone.
This is peek unreliabilty. But nothing unusual from MS.
BTW. I am an admin and no group policies affect my notebook. I have my own OU on root level, for my user and my notebook. But I am member of the domain.
EDIT: My first issue was, that a log file of that game became corrupt because of some OneDrive syncing issues. I couldnt delete them until I ran chkdsk. How can you mess a syncing tool up so far, that it makes file system errors?
We just went online with exchange and wanted to move to use more onedrive. Well I don't thinkt that will happen anymore. But why should you care. We pay you for E3 anyway...I really wish you will get to enjoy some antitrust moves soon, because it's only your monopoly, that allows this kind of software.