Windows 'Longhorn' build 4051 (with a build tag of 4051.idx02.0) is a Milestone 7 build of the Microsoft Windows 'Longhorn' operating system and is also the build given to attendees of Microsoft's Professional Developers Conference of 2003. It leaked on October 20, 2003.
A 'Longhorn' concept seen in the promotional video displaying a search box on the Start menu. Build 5048 realizes this feature.
Microsoft Windows Longhorn
Build 5048 includes a number of design concepts and features that would be present in the of Windows Vista, including the theme and visual effects, a search box in, a new Category organizational structure for the Control Panel, and the Sync Manager. It is the also the first known build to include an instant search feature on the Start menu—a feature previously present in 'Longhorn' concepts—and also introduces a treeview for the 'All Programs' view on the Start menu. This build also notably includes preliminary features that were prominent within the pre-reset 'Longhorn' interface, though they do not work by default: The 'Show Picture Preview on Hover' feature for pictures in Windows Explorer that was present in pre-reset builds; and a reference to Ink File Names—a feature previously shown during and discussed during. Checkboxes—previously seen in pre-reset 'Longhorn' —are also included in Windows Explorer, but are not enabled by default. While had made a significant amount of progress in reinstating 'Longhorn' features, many were surprised that this and similar builds more closely resembled and. Technology blogger and Windows enthusiast Paul Thurrott once stated: 'My thoughts are not positive, not positive at all. This is a painful build to have to deal with after a year of waiting, a step back in some ways.
I hope Microsoft has surprises up their sleeves. This has the makings of a train wreck.' This build includes DWM, but it can crash when starting. Betaarchive user ovctvct wrote a tutorial on how to enable DWM without any crash. Features Windows 'Longhorn' Build 5048 includes preliminary versions of core features that would appear in the RTM version of the operating system.
As build 5048 is the first build to be released publicly by Microsoft after the development reset, it is notable and significant for being the first post-reset build to incorporate many of the concepts and features that were seen previously.