A Microsoft file hosting and synchronization service.
Just installed office without deleting the old version (configuring Outlook is a hassle). Anyway Nothing happened. Then decided tot add FilesOnDemandEnabled 0 to onedrive plist. Reboot nothing happened. What I did find was an old version of my files in another hidden directory. So ms is making a mess of it. There seemed to be (or still are?) two versions of one-drive. One for business and one for normal users. Unfortunately they have identical names. No one at ms seems to get the point that a person can have multiple accounts and roles. :-) and use only 2 machines as in my case.
I lost data by the way. My time table which I use to record my hours or january. As far as I can see I will have to delete the onedrive app and every instance of a hidden file which relates to onedrive. Which is a pain since the files have partial UUID in their path/names. great :-(
Then reinstall Onedrive and see if it works. But first download and save my files. I don't like icloud because I can't access it as a drive. Which onedrive can. But if control has to be handed over to a programmer who has no idea off what I want, even can't think of it, syncing as a service ends for me.