 <p>SharePoint document versioning is internal to the server architecture, and cannot be extended.</p> <p><a href="http://social.technet.microsoft.com/Forums/en/sharepoint2010setup/thread/67936a2b-e534-4c53-8802-a601eade73ff" rel="nofollow noreferrer">http://social.technet.microsoft.com/Forums/en/sharepoint2010setup/thread/67936a2b-e534-4c53-8802-a601eade73ff</a></p>