Windows Vista build 6003

Windows Vista build 6003 is an updated version of Windows Vista Service Pack 2 that was first introduced in the KB4493471 update for Windows Server 2008 as the minor revision numbers are limited to a certain range. This build number change allows its server counterpart to be serviced for the remainder of its lifecycle by pushing back the revision number, whilst keeping the overall version number unique.

It features a new version of the HAL (Hardware Abstraction Layer) which fixes the corruption bug that affects Intel CPUs based on Haswell and later microarchitectures, present in x64 versions of build 6002 and older. The new HAL present in this build does not fix the clock drift issue that also affects Haswell and later microarchitectures.