Bringing the features of Git and GitHub to Microsoft Word
The short version
Simul Documents is a collaboration tool bringing ...
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Or you can use SharePoint.
SharePoint is a great product and Simul offers direct integration: simuldocs.com/blog/ben-morris/shar...
But SharePoint does not allow users to manage copies, parallel versions such as branching and merging and can become messy when collaborating externally.
Also, the version history of SharePoint simply shows that a document has changed and does not do a diff or comparison for you.
Why not just use Google Docs?
:D
Very interesting tool, will keep an eye for updates