It's even weirder than that :) The initial release of XP for Itanium was more or less a stripped down XP build with limited 64 bit support. They then quickly ga

It's even weirder than that :) The initial release of XP for Itanium was more or less a stripped down XP build with limited 64 bit support. They then quickly gave up on that approach and released a second version of Windows XP for Itanium, together with the launch of Itanium 2 support, which was, as you said, a rebranded Server 2003.