Windows 7 Pro Service Pack 1 -

A fresh Windows 7 Pro SP1 machine is missing critical components for the modern web.

While SP1 was largely a maintenance release, it did introduce specific technical improvements: windows 7 pro service pack 1

The system reserved partition is too small (typical of OEM upgrades from Vista). Fix: Use Disk Management to shrink C: and expand the System Reserved partition to at least 350MB. A fresh Windows 7 Pro SP1 machine is

Alternatively:

These UI features (drag a window to the side to snap it, hover over taskbar to peek at desktop) seem simple now, but in 2011, they revolutionized productivity. SP1 refined these animations to be buttery smooth. but in 2011

Why specifically "Professional"? While Home Premium was for consumers and Ultimate offered BitLocker everywhere, Windows 7 Pro struck the perfect balance: