@carmicaeld
read my previous posts... what you quoted was only a part of a point I was making.... if you read the posts before that you'll get it.
With regards to your post about reusing the XP kernel.... It all boils down to money.... a new OS will mean more money for Microsoft since they expect people using XP to migrate to Vista. Its financial suicide for them to support DX10 on XP ... because this is one of the selling points of vista.
Don't u get it? Technically it is possible for them to do it BUT business wise.. they don't want to do it.. Whatever time and production costs you mention are far outweighed by the revenues generated by a new OS. M$ wants you to keep paying them for a new OS every few years... get it?
M$ is more of a business /marketing firm than it is a software company.