Windows XP Professional x64 Edition (released in 2005) has its own unique backstory that complicated licensing:
Windows XP Professional x64 Edition laid the groundwork for later 64-bit operating systems, including Windows Vista, Windows 7, and eventually the mainstream shift to 64-bit computing. It demonstrated both the performance potential and the ecosystem difficulties of moving away from 32-bit architectures. windows xp professional 64 bit product key
For decades, many believed hackers had cracked the Windows Product Activation (WPA) system. However, in 2024, legendary Microsoft engineer Dave Plummer (creator of Task Manager) revealed it was actually a developer mistake . Windows XP Professional x64 Edition (released in 2005)
Windows XP Professional 64-Bit Product Key: Installation, Activation, & Legacy Guide including Windows Vista