www.microsoft.com runs on Longhorn Beta 3http://blogs.technet.com/mcs-ireland-infrastructure/archive/2007/06/19/www-microsoft-com-runs-on-longhorn-beta-3.aspxMicrosoft.com is the world's 5th most heavily accessed website based on number of unique visits. And it's running on Longhorn. See here for more details.en-IECommunityServer 2.1 SP1 (Build: 61025.2)