Windows Longhorn/6.0.4088.Lab02 N.040706-1655

Windows "Longhorn" build 4088 (with a build tag of 4088.Lab02 N.040706-1655) is a Milestone 7 build of the Microsoft Windows "Longhorn" operating system.

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About Windows dialog box in build 4088
Kernel version	NT 6.0
CPU architecture	x86
Edition	Porfessional
BIOS date	July 7 2004

Its Preinstallation Environment is hosted on the BetaArchive FTP server along with the full version which got leaked on 2015-01-13. One screenshot of the Windows Preinstallation Environment has been shown by BetaArchive member, bashar2000.

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  Windows PE loading screen

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  Factory Preinstallation

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  Windows Task Manager displaying the operating system's build string

Leak

On January 13, 2015, Daniel uploaded the full version of this build to BA's FTP.

Previous attempt

A video of the full installation of this surfaced on February 19, 2014, almost a year before it leaked. On October 31, 2014 a BetaArchive member had requested a leakage of this build from the creator of the February 19, 2014 video. The video's creator had considered releasing the build to BetaArchive, but after catching sight of some derogatory posts* about them (and possibly others) the person had declared that they will not leak the build to BetaArchive. It is unknown if the person will reconsider their verdict.

*The poster(s) and their posted content may not be disclosed or linked on this page for privacy reasons. If you want to see the posts then you can look for them yourself. However, BetaArchive is not, and can not be responsible for any action(s) you may commit during and/or after learning such information.