They weren't sure if x86 was going to be competitive in the long run at that point, so they were porting to all the major architectures. I even heard rumors of

They weren't sure if x86 was going to be competitive in the long run at that point, so they were porting to all the major architectures. I even heard rumors of a SPARC port of NT 3.51 but I've never seen it in the flesh. Solaris even ported to PPC (specific RS6K boxes) for Solaris 2.5.1; I've got a copy of that ISO image around somewhere but never had the right hardware to run it.