Everything works except 2003 mailbox users using OA
test exchange connectivity gives:
when testing exchange 2003 user fo rrpc/http I get:
RPC_S_SERVER_UNAVAILABLE error (0x6ba) was thrown by the RPC Runtime
I did everythign I could find on the internet to try and solve this:
disabled IPV6, disabled/renabled OA, checked IIS settings, etc.