Despite backward compatibility from 64bit to 32bit not everything is going to work there. And not everyone is all 64bit ready! Don't forget many still run systems with 32bit only cpu and hardwares. How do you install a new 64bit OS on a 32bit system? You don't!
That's what MS looks at there as well anyone else(Apple, Linux, SUN) has to look at as well. It will be a gradual process to see people even think about XP Pro 64bit let alone the latest version MS puts out. With the increased drive space here I could eaily place either of the 64bit versions of Windows along with a 64bit Linux distro at some point. With two more 500gb satas added in the present built it would be a surprise not to at least one 64bit OS installed here.
That's what MS looks at there as well anyone else(Apple, Linux, SUN) has to look at as well. It will be a gradual process to see people even think about XP Pro 64bit let alone the latest version MS puts out. With the increased drive space here I could eaily place either of the 64bit versions of Windows along with a 64bit Linux distro at some point. With two more 500gb satas added in the present built it would be a surprise not to at least one 64bit OS installed here.