I struggle to get the president of our company Iphone to work with our windows 2003 server.
I used this document to setup the IPhone.
http://support.apple.com/kb/HT2480
The phone validated and appeared to be working fine, but no email, calendars or contacts would appear in the phone. Although phone would report that it was updated.
I realized that I was getting an error when I tried from a browser to hit https://registerdomainname/oma
I found this article below that I tried first. I was able to connect to the server just fine. However, I realized that I was not requiring SSL connections.
http://support.microsoft.com/?id=883380
Once I enable require ssl connections I had the same error. I looked a little further and found this document that solved the problem.
http://support.microsoft.com/kb/817379