One way Windows is getting leaner and meaner is by reducing Software bloat.
"One thing that is changing is Microsoft's approach to product bundling. I'm sure everyone is at least passingly familiar with the fact that the software giant has gotten into trouble with antitrust regulators around the globe for bundling applications into Windows. So with Windows 7, many bundled apps--such as Windows Mail, Movie Maker, and Photo Gallery--are being yanked out of the OS and will be made available as separate free downloads from Windows Live. This change has two nice side effects. One, it keeps Windows lean and mean, and allows those who are not interested in such fluff to keep those bits--and their various problems and resulting updates--off their PCs. Second, it allows Microsoft to update these applications much more frequently. Windows Live applications can be updated monthly, quarterly, or yearly, instead of every two-to-four-years when they're part of Windows. (And for antitrust enthusiasts, let's face it, less bundling means less oversight.)"
http://www.winsupersite.com/showcase/win7_toosoon.asp
Built-in email, editing ditched in Windows 7
Microsoft chooses the Live route
Built-in email, editing ditched in Windows 7 - Software - Breaking Business and Technology News at silicon.com