: A communication framework that became the Windows Communication Foundation (WCF).
Today, Longhorn lives on as a piece of digital history for hobbyists and collectors. Many of these early, experimental builds (such as Build 4074 or Build 4093 ) are preserved on sites like Internet Archive : : A communication framework that became the Windows
: Builds are categorized by "Milestones" (M1 through M7) and "Beta" phases, documenting the shift from the original vision to the post-reset Vista era. : Extensive collections like the (WIP) Microsoft Windows
: Extensive collections like the (WIP) Microsoft Windows Longhorn and Vista build collection allow users to explore these unreleased interfaces and features in virtual machines. Legacy and Build Collections : Longhorn was developed
However, the code became so unstable and unmanageable that Microsoft scrapped years of work in 2004, resetting development to use the Windows Server 2003 codebase as a stable foundation. This revised project eventually launched in late 2006 as . Legacy and Build Collections
: Longhorn was developed for both 32-bit (x86) and 64-bit (x64 and IA-64) systems.
Longhorn was designed to revolutionize Windows with features like: : A new filesystem based on database technology.