Actually, AOLserver 4.0 beta is running on Win32, there's even a site in Ireland that's running it along with PG+Cygwin.
The work to bundle AOLserver up with a proper installer and decisions as to which version to support (4.0 final I presume) should come in a few weeks. There are other threads around here on the issue which you may be able to find by clever searching (then again they may be hard to weed out from the chaff)...
