On January 4 , Microsoft discontinues Windows XP 64 - Bit Edition , as no PCs with IA - 64 processors had been available since the previous September .
On January 4 , Microsoft announces that it is developing x86 - 64 versions of Windows to replace it .
On January 4 , Microsoft discontinues Windows XP 64 - Bit Edition , as no PCs with IA - 64 processors had been available since the previous September , and announces that it is developing x86 - 64 versions of Windows to replace it .