Sharepoint vs Plone

Não sei se existem muitas comparações entre essas duas ferramentas de gestão de conteúdo. Achei essa aí interessante, embora retirada de uma fonte que aposta no Plone (top-ten questions about plone). Alguém defenderia o sharepoint nos quesitos comparados?

• Plone is far more accessible and standards compliant than Sharepoint.
  
• Plone is easier to install and deploy.
• Sharepoint has an expensive per-server and per-user licencing scheme, Plone is Open source and therefore does not cost anything.
• Sharepoint creates and uses local NTFS permissions, so migrating data between systems is difficult.
• Sharepoint has limited support for non-Windows clients, except perhaps Macs, whereas Plone has an active community and a wide variety of free/open source products.
• Plone can run on different server Oses architectures (Solaris, Linux, Windows / Intel, Sparc).