SBS 2003 OMA error, trying to link iPhone to Exchange

Hi guys,

I am having an issue with my SBS 2003 setup. I am trying to connect an iPhone into Exchange and I am struggling massively to find the solution. Been looking about but the problems are still there.

The logs show the connection trying to get through for the user but it then all goes wrong and Event viewer states:
An unknown error occurred while processing the current request:

Message: The remote server returned an error: (501) Not Implemented.

Source: Microsoft.Exchange.OMA.ExchangeDataProvider

Stack trace:

at Microsoft.Exchange.OMA.ExchangeDataProvider.OmaWebRequest.GetRequestStream()

at Microsoft.Exchange.OMA.ExchangeDataProvider.ExchangeServices.GetSpecialFolders()

at Microsoft.Exchange.OMA.ExchangeDataProvider.ExchangeServices..ctor(UserInfo user)

Message: Exception has been thrown by the target of an invocation.

Source: mscorlib

Stack trace:

at System.Reflection.RuntimeConstructorInfo.InternalInvoke(BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture, Boolean isBinderDefault)

at System.Reflection.RuntimeConstructorInfo.Invoke(BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)

at System.RuntimeType.CreateInstanceImpl(BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture, Object[] activationAttributes)

at System.Activator.CreateInstance(Type type, BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture, Object[] activationAttributes)

at Microsoft.Exchange.OMA.UserInterface.Global.Session_Start(Object sender, EventArgs e)

Message: Exception of type Microsoft.Exchange.OMA.DataProviderInterface.ProviderException was thrown.

EventMessage:

UserMessage: A System error has occurred while processing your request. Please try again. If the problem persists, contact your administrator.

Source: Microsoft.Exchange.OMA.UserInterface

Stack trace:

at Microsoft.Exchange.OMA.UserInterface.Global.Session_Start(Object sender, EventArgs e)

at System.Web.SessionState.SessionStateModule.RaiseOnStart(EventArgs e)

at System.Web.SessionState.SessionStateModule.CompleteAcquireState()

at System.Web.SessionState.SessionStateModule.BeginAcquireState(Object source, EventArgs e, AsyncCallback cb, Object extraData)

at System.Web.AsyncEventExecutionStep.System.Web.HttpApplication+IExecutionStep.Execute()

at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)

Event ID 1503

Source MSExchangeOMA

I had installed a certificate on the Default Website but have since removed it and took all SSL and forms based authentication off after reading several articles. After doing this i have also restarted the IIS services.

I tried to access the website via a web browser but got the error  "A System error has occurred while processing your request. Please try again. If the problem persists, contact your administrator."

I tried turning WebDAV on as one article suggested and this caused other issues with the page now saying "Item no longer exists. The item you are attempting to access may have been deleted or moved.
Home"

In the Event Viewer the log shows:

Unexpected Exchange mailbox Server error: Server: [server.domain.local] User: [user@domain] HTTP status code: [501]. Verify that the Exchange mailbox Server is working correctly

This message has the Event ID of 3005 Source: Server ActiveSync

Any help would be appreciated