A Microsoft file hosting and synchronization service.
So i did try to go in and see the file versions, but that option was grayed out so I couldn't click it. I should also say that the file in the OneDrive folder has disappeared completely, so the only way to access it is on my computer, but if I were to accidentally close it, it'd be gone totally. I did contact our IT guy to see if it was an issue with our company server, but he wasn't able to help much, and isn't too familiar with Excel.