Microsoft might very well claim that Windows 7 Server Beta is designed to be deployed exclusively for testing and not production environments, but the company has an entirely different set of rules when it comes down to its own infrastructure. While letting the world test drive Windows Server 2008 R2 Beta, the software giant has already deployed the operating system, along with Internet Information Services 7.5 on the servers running Microsoft.com. The Redmond giant is referring to the process of adopting its own technology even in pre-release versions as dogfooding.

 

 

And just as it was the case with previous releases of Windows Server, Microsoft.com has completed the transition to Windows Server 2008 R2 Beta and to IIS 7.5, according to Netcraft. The company debuted the migration early in January 2009, just as it was gearing up to make the first Beta of Windows 7 Server available for download to the general public. By the end of the past month, it appears that all the requests on Microsoft.com are handled by IIS 7.5.

 

 

Source: Softpedia

The company has long had a policy of consuming it's own "dog food."

sounds like a good way to debug.