Windows Longhorn build 4039 (Lab06 n.030827-1717)

Windows Longhorn build 4039 (Lab06_n.030827-1717) is a Milestone 6 build of Windows Longhorn, which was shared online on 22 August 2007 along with Windows 95 build 275.

Setup
Setup is mostly similar to the earlier compilation of this build.

New features and changes

 * A new settings page called "Rules and Alerts" is now accessible via the "Rules..." item found in the "Options" menu of a notification. It is possible to create new rules that will apply to a "General Windows notification" containing specific words or phrases specified by the user themselves. For example, creating a new rule whose specific word is "activation" and then choosing the "Never show anything onscreen for these alerts" will stop showing the Windows activation notification.
 * A prototype of the Phodeo feature is included in this build.
 * A new Communication History shell folder is also implemented.

Hidden sidebar tiles
Five sidebar tiles, namely Conversation, Picture Copy Progress, Power, RMA Test Tile and Web Host Tile have a "Transient" property set to  in the registry, which makes them unselectable from the sidebar "Options" menu. By setting the aforementioned property to  it is possible to make them selectable just like other tiles. Simply create a .reg file out of the following text and import it into the registry:

Desktop Compositing Engine
For all its instabilities, although this build's Desktop Compositing Engine can render the DCE window frames, it tends to be extremely buggy easily after a while.

Installation

 * Some copies of this build's installation media cannot be booted normally due to a call to a non-existent index in the  by  . To install this build in this case, either upgrade from a previous build or use a WinPE from a previous build.
 * On some installs, once copying files has completed, setup will fail to create a  file. Although booting will still be possible,   will default to.

Safe Mode
Safe Mode does not log you on due to the login process change in build 4032, as it will result in. This was later fixed in Windows Longhorn build 4042 (main).

Upgrade

 * It is currently not possible to upgrade to this build. After the second reboot, Windows will corrupt the registry and will fail to boot, causing the error  when upgrading from most builds prior to this one.
 * When upgrading from build 4028 ~ build 4038,  terminates with a critical error, and the system will become stuck in a bootloop. The only workaround is to reinstall Windows. This bug persists until build 4053.