Just saw this thread by Bruce Momjian on the postgresql developers list:
(http://archives.postgresql.org/pgsql-hackers/2002-06/msg00056.php)
The only thing left to make oacs 100% win32 compliant is aolserver 
"OK, I think I am now caught up on the Win32/cygwin discussion, and
would like to make some remarks.
First, are we doing enough to support the Win32 platform? I think the
answer is clearly "no". There are 3-5 groups/companies working on
Win32 ports of PostgreSQL. We always said there would not be
PostgreSQL forks if we were doing our job to meet user needs. Well,
obviously, a number of groups see a need for a better Win32 port and
we aren't meeting that need, so they are. I believe this is one of
the few cases where groups are going out on their own because we are
falling behind.
So, there is no question in my mind we need to do more to encourage
Win32 ports. Now, on to the details."