Microsoft CRM writes "When Windows 7 launches sometime after the start of 2010, the desktop OS will be Microsoft's most 'modular' operating system to date. That's not necessarily a good thing, of course; Windows Vista is a sprawling, complex OS. From Microsoft's perspective, though, there are many possible benefits. The OS's developers can add/remove functionality module by module. New modules could be sold post-launch, keeping revenue streams strong. A modular approach could also allow the company to make functionality available on a time-limited basis, potentially allowing users to 'rent' a feature if it's needed on a one-off basis. Microsoft is already testing 'pay as you go' consumer subscriptions in developing countries."