I know there are plenty of solutions to active sync out there on the web, and I think I have tried 90% of them, but I just can't get Active Sync working. I'm using https://www.testexchangeconnectivity.com
which gives me the error "Exchange ActiveSync returned an HTTP 500 response" I have gone through MS recommendations found at http://support.microsoft.com/kb/937635
and many others. Active sync was working fine on this server. It's an SBS 2003 serverSP2 with Exchange SP2. It stopped working after it was hosted in a VM environment. IP addresses have changed for the server (internal and External) but the SSL is still correct and I have changed IIS Default Web server from (All Unassigned) to the internal IPs and back again testing both settings.
I have also enabled and disabled forms based authentication and disabled again testing between changed after resetting IIS.
Any one out there able to help?