Windows Longhorn Pre-Reset

Windows Longhorn was the pre-release codename for Windows Vista and was the successor to Windows XP and Windows Server 2003 (built from NT 5.2 codebase). Development on the OS started in May 2001 and went through two unique development cycles separated by a development reset in 2004. The reset occurred as Microsoft's development staff had lost focus on the project as a whole and what was required to be done in order to bring it to market. Features were being written into the OS at an alarming rate with a significant lack of QA or vision of true requirement. This combined with Microsoft's trustworthy computing initiatives caused the reset.

Several features of Longhorn planned that were actually shipped include the glass replicating Aero theme (which followed the Slate and Jade themes from earlier builds), along with the Windows Sidebar - although this was shipped as a standalone utility where as most builds (at least in pre-reset) shipped this as part of explorer.exe. Numerous improvements to the Windows Explorer, along with an updated Internet Explorer 7, Windows Media Player 11, instant search, new 3-d games and other items made it into the final version of Windows Vista.

Release notes

Windows Longhorn existed as a continuation of the Windows 2003 codebase although after build 4094 development was reset; restarted from scratch as the original Longhorn builds were growing in complication (described as 'a mess') and Microsoft introduced a new focus on security. These are the pre-reset builds.

Product type
Release date
Minimum CPU
1.0Ghz P-III or compatable
Minimum RAM
Minimum free disk space
User interface
Download count
752 (642 for release)


Download name Version Language Architecture File size Downloads
Windows Longhorn (6.0.3683.0) (beta) 6.0.3683 Prerelease English 538.72MB 61
Windows Longhorn (6.0.3718.0) (beta) 6.0.3718 Prerelease English 646.28MB 21
Windows Longhorn (6.0.4008.0) (beta) 6.0.4008 Prerelease English 562.1MB 52
Windows Longhorn (6.0.4011.0) (beta) 6.0.4011 Prerelease English 553.26MB 20
Windows Longhorn (6.0.4015.0) (beta) 6.0.4015 Prerelease English 586.14MB 19
Windows Longhorn (6.0.4029.0) (beta) 6.0.4029 Prerelease English 592.2MB 22
Windows Longhorn (6.0.4033.0) (beta) 6.0.4033 Prerelease English 613.6MB 18
Windows Longhorn (6.0.4039.0) (beta) 6.0.4039 Prerelease English 632.41MB 54
Windows Longhorn (6.0.4042.0) (beta) 6.0.4042 Prerelease English 681.88MB 23
Windows Longhorn (6.0.4051.0) (beta chk) 6.0.4051 Prerelease English 714.82MB 13
Windows Longhorn (6.0.4051.0) (beta) 6.0.4051 Prerelease English 677.53MB 18
Windows Longhorn (6.0.4051.0) (x64 beta chk) 6.0.4051 Prerelease English 527.06MB 14
Windows Longhorn (6.0.4051.0) (x64 beta) 6.0.4051 Prerelease English 477.87MB 28
Windows Longhorn (6.0.4053.0) (beta) 6.0.4053 Prerelease English 693.28MB 16
Windows Longhorn (6.0.4066.0) (beta) 6.0.4066 Prerelease English 596.2MB 1
Windows Longhorn (6.0.4074.0) (beta) 6.0.4074 Prerelease English 749.32MB 99
Windows Longhorn (6.0.4074.0) (x64 beta) 6.0.4074 Prerelease English 643.19MB 77
Windows Longhorn (6.0.4083.0) (x64 beta) 6.0.4083 Prerelease English 500.91MB 31
Windows Longhorn (6.0.4084.0) (WinPE beta) 6.0.4084 Prerelease English 50.57MB 3
Windows Longhorn (6.0.4088.0) (WinPE beta) 6.0.4088 Prerelease English 49.74MB 3
Windows Longhorn (6.0.4093.0) (beta) 6.0.4093 Prerelease English 952.5MB 49


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