Of course, if you are looking for the offline version, the full desktop version, that is much harder to come by for free. So, you can store your documents here and open them up to others, as you see in the screenshot above. It works very similarly to Google Docs, arguably the de facto standard for online collaboration, and why you see Microsoft online at this level - because they cannot continue to give up ground to Google, frankly.
I find the Office Online version keeps things simple for creating, using, and sharing documents with others.
