Mobile WebMail Not Configured Correctly

Mobile WebMail requires .NET 3.5. If you don't want to use MobileWebmail, you should disable it in the MMC. Otherwise, you should install .NET 3.5, and add the following to the web.config:

<configuration>
  <system.web>
    <pages>
      <controls>
        <add tagPrefix="asp" namespace="System.Web.UI.WebControls" assembly="System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
      </controls>
    </pages>
  </system.web>
</configuration>