I have Exchange Server 2010 SP3 RU8 Enterprise 64 bit  on Windows 2008 R2 64 Bit Server

When I use EMC > Recipient Configuration > Mailbox select Display Name  click on Manage Mobile Phone

I receive over 35 Event Id 1003 errors.

I have a script I run which runs get-activesyncdevicestatistics  that also causes event id 1033 35 times.

I have applied these fixes

http://www.eventid.net/display-eventid-1033-source-MSExchange%20ActiveSync-eventno-11120-phase-1.htm

From a Microsoft support engineer: "If this is not a partner-hosted environment, you can safely ignore this error. It is simply a warning that the ExternalProxy setting is not set in the web.config. We use a default value of null when we find this.

 If you are not partner hosted and want to get rid of the warning, add a key under the <appSettings> key in your \Program Files\Microsoft\Exchange Server\V14\ClientAccess\Sync\web.config file:
 <add key="ExternalProxy" value=""></add>

 The warning should have only been appearing when the application pool was recycled and just spinning up.  You will need to either recylce the MSExchangeSyncAppPool or do an iisreset and then check your application log. You should no longer see the event."

This one

<system.webServer>
    <modules>
    </modules>
    <handlers>
      <add name="AirSyncHandler" verb="GET,HEAD,POST,DEBUG,OPTIONS" path="*" type="Microsoft.Exchange.AirSyncHandler.Handler, Microsoft.Exchange.AirSyncHandler" />
    </handlers>
        <httpErrors>
            <remove statusCode="501" subStatusCode="-1" />
            <error statusCode="501" prefixLanguageFilePath="C:\inetpub\custerr\de-DE" path="501.htm" responseMode="File" />
        </httpErrors>
  </system.webServer>

Restarted IIS

Restarted the server Still get this error  

Any suggestions would be great

Thank you

Tom