Windows Vista build 6003

Windows Vista build 6003 is an updated version of Windows Vista Service Pack 2.

It was first introduced in the KB4493471 update for Windows Server 2008 because the minor revision numbers are required to stay within a certain range ( inclusive, or decimal 16384-24575; the version of the kernel in the previous month's update is , where the minor revision number is  ). 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.

This is the last build to include the Classic Start menu, first seen in Windows 95, since starting from Windows 7 build 6469 the Classic Start menu has been completely removed and can no longer be enabled.

Installation
By installing the April 2019 Security Monthly Quality Rollup update (KB4493471) in Windows Vista SP2, the version number will be changed to.