Cual es la diferencia entre Microsoft Office Enterprise, Profesional Plus, Standard

Esta es la lista de programas del Office según su versión.

Office Basic 2007
-Excel 2006
-Outlook 2007
-Word 2007

Office Standard 2007
-Excel 2007
-Outlook 2007
-PowerPoint 2007
-Word 2007

Office Hogar y Estudiantes 2007
-Excel 2007
-OneNote 2007
-PowerPoint 2007
-Word 2007

Office PYME 2007
-Excel 2007
-Outlook 2007 con Business Contact Manager
-PowerPoint 2007
-Publisher 2007
-Word 2007

Office Professional 2007
-Access 2007
-Excel 2007
-Outlook 2007 con Business Contact Manager
-PowerPoint 2007
-Publisher 2007
-Word 2007

Office Professional Plus 2007
-Access 2007
-Communicator 2007
-Excel 2007
-InfoPath 2007
-Outlook 2007
-PowerPoint 2007
-Publisher 2007
-Word 2007

Office Enterprise 2007
-Access 2007
-Communicator 2007
-Excel 2007
-Groove 2007
-InfoPath 2007
-OneNote 2007
-Outlook 2007
-PowerPoint 2007
-Publisher 2007
-Word 2007

Office Ultimate 2007
-Access 2007
-Excel 2007
-Groove 2007
-InfoPath 2007
-OneNote 2007
-Outlook 2007 con Business Contact Manager
-PowerPoint 2007
-Publisher 2007
-Word 2007