Is DX10 only going to be avaliable via Vista ? If so Why would microsoft not make it avaliable to XP users as DX9 was to 2000 and 98 ? I think game developers will be very reluctant to release any big titles if in DX10 if it is proprietary to a operating system that roughty 5% or less of the market is going to be using within the first 1-2 years after release. Transition to a new OS takes time, years in some cases as it did from 2000 to XP. Is DX10 just not capable of running in a XP envirorment ?