Windows Longhorn build 4017

Windows Longhorn build 4017 is a Milestone 5 build of Windows Longhorn. On 23 January 2020, this build was listed on a thread by Grabberslasher, founder of the UX.Unleaked blog, to be released to the BetaArchive FTP, and was released as the first two builds of his 33 Longhorn/Vista builds on 24 January 2020, alongside build 4029 (Lab06 n). This build shares a lot of similarities with build 4015 (main), including a working Desktop Composition Engine that isn't different to the aforementioned build.

Changes

 * The Avalon taskbar/sidebar application has been removed.
 * The sidebar now doesn't have rendering issues upon changing the resolution.
 * The EULA reference during setup now says "Longhorn" instead of "Whistler".

Setup

 * Setup is similar to that found in build 4015 (main).

Bugs

 * Many drivers aren't installed by default during the hardware portion of setup and have to be installed manually.
 * Once copying files has completed, setup will fail to create a boot.ini file. Although booting will still be possible, NTLDR will default to C:\Windows.
 * The hardware detection portion of setup may crash, and an error message may appear as well. Simply press ALT+TAB to access the error message, and click OK. This will, however, skip the Out-of-Box-Experience.
 * This build can't be installed from CD boot as is. You must use the WinPE from a different build, or upgrade from a previous build.

Themes
Upon changing themes, the icons on the desktop will not show correctly. Refreshing the desktop will usually fix the problem.

Timebomb
It is one of the notable Longhorn builds that has a broken timebomb and can be installed on the current date.