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Windows Server 2008 build 4066 is a pre-reset build of Windows Server 2008, which was originally described by Grabberslasher in his UX.Unleaked blog on 1 May 2008, where it was shortly uploaded by the end of the year. It is currently the last available build of Windows Server 2008 compiled in the pre-reset codebase.

This build reimplements most of the features that were originally stripped off during the transition towards the Slate interface, and introduces many features and Desktop Window Manager improvements that were demonstrated earlier on the build 4050 showcase and became widely available in build 4074. Aero resources are also included, although they cannot be normally used.


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