https://www.dotnetzone.gr:443/cs/blogs/pkefal/archive/2010/01/12/windows-azure-amp-ndash-did-you-know-that-you-can-set-your-os-version.aspxWindows Azure configuration files support an osVersion attribute where you can set which version of the Windows Azure OS should run your service. This feature doesn’t make much sense at the moment as there is only one version WA-GUEST-OS-1.0_200912-01elCommunityServer 2.1 SP3 (Build: 20423.1)