The letter is dated 2007-10.

AMD released (ie commercially available) Pacifica on May 23, 2006 while Intel did released their Vanderpool a half of year earlier November 14, 2005. [0]

Windows Server 2008 was RTM'ed on February 2008 which provided Hyper-V as a first class component. [1]

Virtual Server 2005 R2 SP1 added support for both Intel VT (IVT) and AMD Virtualization (AMD-V) and was released 11 June 2007. [2]

https://en.wikipedia.org/wiki/X86_virtualization#AMD_virtual...

https://en.wikipedia.org/wiki/Windows_Server_2008

https://en.wikipedia.org/wiki/Microsoft_Virtual_Server#Versi...