A Microsoft file hosting and synchronization service.
1
If you are unable to close the document without saving the document, at the top left of Word, is there an AutoSave button enabled, if so, if you disable that does that resolve the problem.
2
If you do not have the File - Options setting in Word, what type of device are you using the Office apps on, is that a Windows device or an Apple Mac computer?
Please provide a screenshot of your Word window.