windows server or NT en general

A main design goal of NT was hardware and software portability. Various versions of NT family operating systems have been released for a variety of processor architectures, initially Intel IA-32, MIPS R3000/R4000, and Alpha, with PowerPC, Itanium, AMD64 and ARM supported in later releases.

  Windows Server 2012 will be the first version of Windows Server to have no support for Itanium-based computers since Windows NT 4.0