Leaked Microsoft software is nothing new. Both Windows 7 and Office 2010 kept getting leaked during their development stages. Now, Softpedia is reporting that an internal Windows 7 Service Pack 1 build has been leaked. Although some websites are claiming that this is the release candidate (RC), the leaked file is most likely a pre-RC build.
The leaked image is a chinese Windows 7 (32 bit) installation, which has been slipstreamed with SP1. The build number is 6.1.7601.17104. According to reports, the leaked build is time bombed to 01.09.2011. In other words, the leaked build will stop working in September 2011. This indicates that the leaked build is at least a month old.
Installing leaked builds is never recommended. Not only are they likely to be unstable and rough around the edges, but there is also the possibility that they have been tampered by the releaser. However, if you are dying to get your hands on the latest and greatest from Microsoft, then you should be able to locate the leaked release with a simple Google search.