I am using SoftMaker Office 2016, (http://www.softmaker.com/en/softmaker-office-linux http://www.softmaker.com/en/softmaker-office-linux) on my Linux box and it

I am using SoftMaker Office 2016, (http://www.softmaker.com/en/softmaker-office-linux http://www.softmaker.com/en/softmaker-office-linux) on my Linux box and it works great for collaborating on MS Office documents - preserves formatting and everything else without a problem.