There is a growing consensus of opinion forming that Windows "Seven" will be "modular," the concept being that you buy the core OS first and then add to it individual "modules" with logically distinct units of functionality. There are two ways the OS could be modularized in such a fashion, the first being that it could be split into functional "roles," such as "music" or "movies" or "mail & chat." The other option, which is a bit more radical, would be to build on the "Windows Live" software that updates/replaces some of the OS components. For example, Vista's Windows Photo Gallery is replaceable with Windows Live Photo Gallery. The Live version is similar in concept, but includes greater online integration and features.
With both Windows Vista and Windows Server 2008, we can see the first few steps in this modular direction, albeit in different ways. Windows Server 2008 has as one of its major features the idea of "roles". Rather than installing everything and the kitchen sink, with 2008 you install the base OS and then choose one or more roles, such as Active Directory domain controller, Web Server, or Print Server, and the software components to support those tasks are installed accordingly.
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