īuild 4015 (build date of March 28, 2003) was leaked to the Internet on April 28, 2003. The 'Display Properties' control panel was the first significant departure, being built on the new 'Avalon' API. An early revision of WinFS was also included, but very little in the way of a user interface was included, and as such it appeared to early testers to be nothing more than a service that consumed large amounts of memory and processor time. An option in this version of the sidebar also made it possible to move the Start button into it, and disable the traditional taskbar entirely. A new 'Sidebar' was also present, which contained many of the gadgets that would much later be seen in Windows Sidebar, such as an analog clock, slide show, and search capability. Also the templates in the My Documents and My Pictures were notably different as well as the Open and Save as dialog boxes also included the template, incorporating aesthetic changes and a few new user interface options. One of the notable changes was that the Windows logo was only white, not colored like all the versions of Windows before it. Visually it was not significantly different from Windows XP. This build was the first of several that had a working title of ' Longhorn XP Professional'. Some builds (such as Beta 1 and Beta 2) only display the build label in the version information dialog (Winver), and the icons are from Windows XP.When installing the milestone 2 builds, the OOBE (the setup process) is the same as Windows XP, but with different music.īuild 3683 (build date of September 23, 2002) was leaked on October 20, 2002, and was the first Longhorn build leaked to the Internet. The lab in which any given build originated is shown as part of the build label, and the date and time of the build follows that. At Microsoft, a number of 'Build labs' exist where the compilation of the entirety of Windows can be performed by a team. Typically, a team working on a certain feature or subsystem would generate their own working builds which developers would test with, and when the code was deemed stable, all the changes would be incorporated back into the main development tree at once. Higher build numbers didn't automatically mean that the latest features from every development team at Microsoft was included.

A typical build label would look like 'Longhorn Build 3663.Lab06_N.020728-1728'. Most builds of Longhorn and Vista were identified by a label that was always displayed in the bottom-right corner of the desktop.

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