A Microsoft file hosting and synchronization service.
Cindy:
Try this, it worked for me.
For me, clicking on the ... then OPTIONS, and unchecking the box "SHOW FILES FROM OFFICE.COM" . I should note that before I unchecked that box, I clicked on the CLEAR button, to erase the list of recent files, and then closed and reopened File Explorer, and the issue was gone. Hope that helps!