+**Windows Longhorn** was the ambitious codename for a major [Microsoft](/wiki/microsoft) [operating system](/wiki/operating_system) development project in the early 2000s. Envisioned with groundbreaking features and a new user interface, its development faced significant challenges, ultimately leading to a reboot that became [Windows Vista](/wiki/windows_vista).
+## See also
+- [Windows XP](/wiki/windows_xp)
+- [Windows Aero](/wiki/windows_aero)
+- [GUI](/wiki/gui)
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