Previously I wrote an article on Microsoft Started Working on Windows 7 Service Pack 1. According to Wzor, Microsoft has already compiles a new build for Service Pack 1 of Windows 7. It’s a big surprise because Microsoft has never start work on service pack of operating system before its final release.
One reason behind this …

According to Wzor Microsoft has started working on Windows 7 Service Pack 1 labeled as 7138.0.090523-xxxx-winmain_win7xxx_sp1_x, though compilation date cannot be found as build number is blocked in a screenshot posted by Wzor.
There is no idea why Microsoft would start working on Service Pack 1 of Windows 7 so early and it makes no sense …