Well, Gartner is saying that Vista will be the last of its kind, as for any future versions using a modular architecture as the current integrated architecture is unsustainable. I don’t think this in itself is anything new (most other companies have been doing it for a while). But in practice this is more difficult than it sounds. It will be quite difficult to break the Windows team and the way they do builds, code branches, etc. Also, what will happen to Longhorn then? However, I do hope Microsoft moves to this model as the existing ones will just keep getting more painful. (go this via osnews.com )