I have one HP server proliant ML350 G6 with OS windows 2008 standard edition installed. I would like downgrade the OS and Microsoft could let me a Kit for the operation with windows server 2003 R2 standard edition. Now I have a doubt for the drivers compatibility. In fact on the page of the product there are Windows Server 2003 and the 64-bit Extended Systems. I think that Win server 2003 and Win server 2003 R2 are different by the kernel and I suppose I will have problem for driver compatibility. What do think about?