[chungy]

That's not really quite accurate. Windows NT began life on the i860, and then was ported to i386 and MIPS, and very shortly after the initial release, ported to Alpha. A year after that, PowerPC.

Through the life of Windows NT 4.0's life span, MIPS and PowerPC died early, and Alpha support was axed just before the very end. In Windows 2000's development, i386 and Alpha were the only ports left, and Alpha was axed before it could make it to final release.

x86 and Alpha lived simultaneously for most of its development. It wasn't done "first" on Alpha (quite the opposite).