Est-il possible de switch entre Windows 7 Editions?

Related question:

When reinstalling Windows 7, does the language, version, architecture (64-bit or 32-bit) or source (OEM, retail, or MSDN) matter?

Je suis actuellement running Windows 7 Enterprise RTM which is part of my MSDN subscription. Cependant J’ai besoin de downgrade to Professional on one of my machines. In Vista you could change entre certain editions by providing the clé de produit and re-activating, cependant this ne work in Windows 7.

Comment puis-je switch editions avec a valid clé de produit sans having to re-installer?

Downgrading to a lower SKU n’est pas possible, from what I know. Windows 7 Enterprise is a superset of Professional, so your seulement option is reinstalling, from my knowledge.

The same thing is true in Vista, vous pouvez seulement upgrade, not downgrade (Home Premium to Business was allowed, the other way around n’était pas allowed).

Modification : ici’s the official response from Microsoft, courtesy of Mary-Jo Foley:

So the answer is no, you ne peut pas use WAU
to move from Windows 7 Enterprise to
Windows 7 Professional parce que that
would essentially be a downgrade.
Windows 7 Enterprise is just like
Windows 7 Ultimate, all du
fonctionnalités are part du SKU.

What WAU is meant to do is allow utilisateurs
to add more fonctionnalités to Windows 7 by
upgrading to a higher edition sans
having to go through a time-consuming
re-installation processus. Il y a a
variety of scenarios in which a utilisateur
may choose to upgrade après the
initial purchase, including:

  • A consumer purchases a PC pre-installé avec Windows 7 Starter
    and wants to turn it invers le best PC
    for entertainment.

  • A customer purchases Windows 7 Home Premium, but realizes they need
    Professional fonctionnalités including Domain
    Join, which provides the ability to
    add the ordinateur to a company or
    school réseau.

  • Someone
    purchases a PC pre-installé avec
    Windows 7 Home Premium and wants to
    experience of all of what Windows 7
    has to offer avec Windows 7 Ultimate.