About Exchange Iphone and OWA

Hello all .
i really need help …
i have an SBS2003 and the OWA is running .
i can acsses the OWA from HTTP:\\serverip\exchange
i want to configure my iphone 3g to work with the Exchange and i can’t seem to make it work .
by the way : i can’t logon to the OWA using: https://serverip/exchange or http://servername/exchange or
https://servername/exchange

can anyone help me out …
i’m going crazy .. i’m looking for the answer for about 5 days now..
the ports : 80 , 443 , 135 are open ….
please tell me what’s my problem !!
thanks a lot
ok103