From reading this thread I would think they're NT too. I'm sorta shocked though, not from a stability standpoint, but from a cost standpoint. You figure they bought the 5 Cal cheapie version of NT, that's still like 499.00 a pop. And if they ever upgraded to 2K, then they're prolly gonna use Microsofts Open "rent-a-licence" scheme. Linux woulda been cheaper.
I've heard that the patcher program is just HTTP over a non-standard port. If that's the case, hope they're not using IIS LOL.
-Joojooga