Error 0x80070057 occurs when you create an Outlook 2010 profile by using the Auto Account Setup process for an Exchange 2003 mailbox

The following error is mainly encountered for organizations running Exchang 2k3 and using Outlook 2010 clients. This is generally an Audtodiscover failure.

The following issue can be resolved by the following steps:

1.  Create a custom autodiscover.xml file by making required changes in this template.

<Autodiscover xmlns="http://schemas.microsoft.com/exchange/autodiscover/responseschema/2006">

 <Response xmlns="http://schemas.microsoft.com/exchange/autodiscover/outlook/responseschema/2006a">

    <Account>

      <AccountType>email</AccountType>

      <Action>settings</Action>

      <Protocol>

        <Type>EXCH</Type>

        <Server>E2K3.test.com</Server>

      </Protocol>

    </Account>

  </Response>

</Autodiscover>

*** Just change the servername

Save this file either on the Local Disk or ona SHared Location to be used by other clients.

2. Make the following Registry Change:

Now On the Outlook client, deploy the following registry data:
Key: HKEY_CURRENT_USER\Software\Microsoft\Office\14.0\Outlook\AutoDiscover

DWORD: PreferLocalXML
Value: 1

String: the name of your domain
Value: the path of the Autodiscover.xml file that includes the file name

Now, try using AutoDiscover.............. :) :)