A Microsoft file hosting and synchronization service.
Yesterday I noticed that One Drive would not sync. Word and excel were returning a message along the lines of "One Drive Host is in read only state, changes will not be synced at this time... try later...." Wish I had screen shotted that. Now today, right after first login, all my files are syncing. No message from Microsoft about the "read only state", that's a bit disconcerting.