Windows Longhorn

Windows Longhorn

Microsoft Windows codename Longhorn
Codename Preliminary name	Longhorn
Kernel version	NT 6.0
CPU architecture	x86, x64, IA-64
Release date	Unreleased
Support end	None
Preceded by	Windows XP
Succeeded by	Windows Vista

Longhorn Architecture, as presented at PDC 2003

"Longhorn" was the codename for the planned successor of Windows XP. The project was cancelled and replaced with a new project with a similar codename - Longhorn Omega-13, that was renamed to Vista that became the real successor of XP. Early Vista builds often were referred to as just Longhorn most of the time and those two projects often were mistaken.

One of the biggest differences to Windows XP was that applications for Longhorn were supposed to be developed in managed languages, mainly C#, and that the "traditional" Win32 API should be replaced with managed .NET libraries in many places. During Longhorn development, many parts of the OS were rewritten in .NET 1.2 (can be seen as a prototype of .NET 2.0), causing bugs and memory leaks, especially in Windows Explorer.

Logos

During the development, the design team created several different logos. The old XP-style flag also is used in many places. Early builds with the Plex theme used a solid white version of the Windows flag, which was never seen before in Windows development.

• 

  Early Longhorn logo (M3-M5)

• 

  Early Longhorn logo used during WPF presentation

• 

  Used in some Aurora and Phodeo resources

• 

  Used in some Longhorn M7 resources

• 

  Longhorn glass flag

Concepts, presentations, demos and prototypes

• Earliest concepts (2002, 2003)
• MSX "Longhorn Days" (2003)
• Amazon.com demo (PDC 2003)
• Hillel Cooperman's demo (PDC 2003)

Builds

• No information available
• Existence doubtful
• Information or pictures available
• Leaked or released

Milestone 1 / 2 - unconfirmed

NOTE: Many sources claim that M1 and M2 were only planning phases of Longhorn; the first confirmed build is M3 3663.

• Longhorn Build 3551.Lab01_N(storbuild).010917-1031
• Longhorn Build 3555.Lab01_N(storbuild).010925-0806
• Longhorn Build 3557.Lab06_DEV(lamadio).010927-0921
• Longhorn Build 3561.Lab01_N(storbuild).011003-1326
• Longhorn Build 3562.Lab03_N.011002-1958
• Longhorn Build 3589.Lab01_N(johnstra).011110-2230
• Longhorn Build 3590.Lab01_N.011118-2000
• Longhorn Build 3593.Lab01_N(daved).011129-1917
• Longhorn Build 3595.Lab01_N.011203-0927
• Longhorn Build 3599.Lab02_N(ntvbl02).020107-1351
• Longhorn Build 3609.Lab01_N.020211-2000
• Longhorn Build 3630.Lab03_dev(yasuho)
• Longhorn Build 3631.Lab03_dev(skatari).020509-1043
• Longhorn Build 3635.Lab01_N.020517-1743
• Longhorn Build 3637.Lab01_N.020522-2000
• Longhorn Build 3646.Lab01_N(portbld).020612-1346
• Longhorn Build 3661.Lab01_N(ianserv).020709-0927
• Longhorn Build 3663.Lab01_N.020724-2000

Milestone 3

• Longhorn Build 3663.Lab06_N.020728-1728
• Longhorn Build 3670.Lab06_N.020819-1749
• Longhorn Build 3680.Lab03_dev(skatari).020509-1043
• Longhorn Build 3683.Lab06_N.020923-1821
• Longhorn Build 3706.Lab06_N.021029-1731
• Longhorn Build 3708.Lab06_N.021108-1847
• Longhorn Build 3713.Lab06_N.021113-1841
• Longhorn Build 3718.lab06_N.021119-1730
• Longhorn Build 3728.dnsrv_dev(sergueik)
• Longhorn Build 3750.private_lab06_dev_ux(thomasj).021128-1402

Milestone 4

• Longhorn Build 4001.main.021204-1515
• Longhorn Build 4002.Lab04_N(yongqu).021218-1747
• Longhorn Build 4002.Lab06_N(ntvbl06).030108-1926
• Longhorn Build 4003.Lab01_N(forrestf).030116-1035
• Longhorn Build 4006.Lab01_N.030209-2000
• Longhorn Build 4006.main.030203-1038
• Longhorn Build 4007.main.030212-2037
• Longhorn Build 4007.main.030214-????
• Longhorn Build 4007.main.030219-1933
• Longhorn Build 4008.Lab01_N(briangu).030220-0837
• Longhorn Build 4008.main.030219-1933
• Longhorn Build 4011.main.030305-2045
• Longhorn Build 4014.Lab01_N.030325-2000 (Typo?)
• Longhorn Build 4014.Lab01_N.030326-2000

Milestone 5

• Longhorn Build 4015.main.030328-1500
• Longhorn Build 4015.Lab06_n.030403-1706
• Longhorn Build 4018.Lab06_n.030417-1721
• Longhorn Build 4019.lab01_N.030428-2000
• Longhorn Build 4021.main.030415-0745
• Longhorn Build 4023.Lab06_N(dandinu)
• Longhorn Build 4028.Lab01_N.030701-2000
• Longhorn Build 4029.main.030619-0000

Milestone 6

• Longhorn Build 4030.Lab06_n.030630-1724
• Longhorn Build 4032.Lab06_n.030710-1709
• Longhorn Build 4032.LAB01_N(skupec)
• Longhorn Build 4033.main.030717-1555
• Longhorn Build 4033.idx01.030730-1630
• Longhorn Build 4034.private/Lab06_dev(skatari)
• Longhorn Build 4034.private/setupvbl(matblock)
• Longhorn Build 4036.Lab01.030729-0100
• Longhorn Build 4038.Lab01_N(bryant).030803-2000
• Longhorn Build 4038.main.030813-1852
• Longhorn Build 4039.Lab06_n.030827-1717
• Longhorn Build 4039.Lab06_n.030828-1802
• Longhorn Build 4039.lab04_n(ahmeti)
• Longhorn Build 4039.private/Lab06_dev(skatari)
• Longhorn Build 4040.Lab04_N.030828-1910
• Longhorn Build 4041.Lab06_n.030829-1500
• Longhorn Build 4042.main.030905-1800

Milestone 7

• Longhorn Build 4042.Lab06_n.030909-1709
• Longhorn Build 4044.Lab06_n.030915-1925
• Longhorn Build 4048.lab02.030923-1849
• Longhorn Build 4050.idx02.030928-0552
• Longhorn Build 4050.private/lab06_demo.031013-1849
• Longhorn Build 4050.private/lab06_demo.031018-2015
• Longhorn Build 4050.private/lab06_demo.031019-1809
• Longhorn Build 4050.private/Lab06_dev(yasuho)
• Longhorn Build 4051.idx02.031001-1340
• Longhorn Build 4053.main.031022-1720
• Longhorn Build 4053.lab01_fusion(jaykrell).031029-2141
• Longhorn Build 4054.private/lab06_dev_ux(reinerf).031104-1800
• Longhorn Build 4057.private/lab06_dev_ux.031107-1900
• Longhorn Build 4058.lab06_n.03118-1808
• Longhorn Build 4059.main.031208-1842
• Longhorn Build 4060.private/Lab06_dev(skatari)
• Longhorn Build 4060.Lab04_dev(yongqu).040113-1005
• Longhorn Build 4061.Lab01_N.040125-2000
• Longhorn Build 4061.Lab01_N(skupec)
• Longhorn Build 4066.main.040226-1010
• Longhorn Build 4067.private/lddm_dev_tech(devdmo).040212-1646
• Longhorn Build 4067.Lab06_n.040307-1603
• Longhorn Build 4067.lab01_fusion.040316-2000
• Longhorn Build 4068.lab07_n(skatari)
• Longhorn Build 4069.Lab06
• Longhorn Build 4071.private/Snap_dev_ux(ntvbl06).040420-1521
• Longhorn Build 4071.private/Snap_dev_ux(ntvbl06).040426-1627
• Longhorn Build 4072.Lab06_n.040201-1902
• Longhorn Build 4073.idx02.040420-1832
• Longhorn Build 4074.idx02.040425-1535
• Longhorn Build 4080.Lab06_n.040429-1614
• Longhorn Build 4080.Lab06_n.040502-1523
• Longhorn Build 4081.main.040503-1625
• Longhorn Build 4083.main.040516-1537
• Longhorn Build 4083.Lab06_n.040519-1614
• Longhorn Build 4084.main.040527-0915
• Longhorn Build 4085.private/Lab06_dev_tech(skatari).040430-0928
• Longhorn Build 4085.main.040603-1817
• Longhorn Build 4085.Lab07.040609-2350
• Longhorn Build 4086.main.040615-1745
• Longhorn Build 4086.lab03_dev.040629-1910
• Longhorn Build 4086.lab01_n.040704-2000
• Longhorn Build 4087.main.040626-0846
• Longhorn Build 4088.Lab07_N.040705-1625
• Longhorn Build 4088.Lab02_N.040706-1655
• Longhorn Build 4088.main(cjensen).040708-1751
• Longhorn Build 4089.private_lab06_dev_ux.040721-1800
• Longhorn Build 4093.Lab03_dev(a-micnaz).040714-1853
• Longhorn Build 4093.main.040819-1215
• Longhorn Build 4093.private/wcp_dev_platform(danmohr).041116-2208
• Longhorn Build 4094.private/Lab06_dev_platform(snaptab).041124-0021
• Longhorn Build 4094.private/Lab06_dev_tech(skatari)

Development reset

See Windows Vista

See also

• Athens PC
• WinHEC 2003
• PDC 2003
• WinHEC 2004

External links

• Windows Vista Builds List - winJade - includes Longhorn, Vista and Vista SP1 build tags
• Microsoft Collection Book - with tips on how to install leaked "Longhorn" builds
• Si vis pacem, para bellum - Grabberslasher's blog that describes several unleaked "Longhorn" builds