[JorgeGT]

The problem is not the lack of alternatives for personal use (I use LaTeX as a Word alternative), it's collaboration. If you are required to produce Word documents, PowerPoint presentantions, etc., using certain corporate templates, or as part of a standardized workflow, then you really need windows.

Also there are other, more specialized programs that require Windows such as SolidWorks, etc.

[AsyncAwait]

I am using SoftMaker Office 2016, (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.