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Itanium was a very unique processor co-developed by HP and Intel with different architecture and instruction sets than anything else before, then or since if I recall correctly. It was different enough that Microsoft had to develop a different OS just to support it. Never took off outside a few niche use cases. XP64 on the other hand was introduced when AMD put out the X86-64 instruction set with the Athlon 64 CPU's. Back then everything was 32 bit, but everyone knew that 64 bit was the future. Built my first box on AMD because at that time they were the only realistic 64 bit game around that was going to survive. Intel did not have anything in the general consumer space or enterprise outside of Itanium that could compete.Look at a Linux ISO download for example. For most, they are labeled AMD64 orX86-64 for 64 bit and X86 or X86-32 for 32 bit. AMD bootstrapped 64 bit into mainstream IMHO.Actually, Microsoft delayed the release of XP64 for over a year to give the other half of the Wintel cabel to try and catch up. Itanium was supported from day 1 on server and workstation OSes