Win XP 64 bit for Itanium systems (based on XP code) came out in 2001.
Win XP 64 bit vs 2003 (based on Windows Server 2003 code) came out in March 2003.
Win XP Professional x64 supporting x86-64 extensions implemented in early AMD and INtel x64 processors released in April 2005. This is the most popular one as it supported all major consumer chips.
So we have 8 or 9 years for the first one, >6 years for the second, and >4 years for the third and main one. Considering that even 2 years in this industry is 'ancient history', the fact that SL is not completely native x64, does in fact, put it right back in the dark ages. I mean common, 4 years MINIMUM for Windows - all without removing support for 32 bit applications! (16 bit has gone the way of the dodo, however)
And also, I've been saying for YEARS (4 of them) now that 64 bit is everything BUT overrated and I've heard nothing different on forums except from those that weren't using it themselves.
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