Вот отличный документ, в котором есть сравнение между

  • Windows SharePoint Services 3.0
  • SharePoint Portal Server 2003
  • Office SharePoint Server 2007 for Search
  • Office Forms Server 2007
  • Office SharePoint Server 2007 Standard CAL
  • Office SharePoint Server 2007 Enterprise CAL or for Internet Site

Сравнение идет по следующим категориям

1. Collaboration
2. Portal
3. Search
4. Content Management
5. Business Process and Forms
6. Business Intelligence
7. Management
8. Platform