Description:
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I have ported code from VBScript to PHP using the ADODB COM object to access and retrieve information from Active Directory. The code works well in VBScript, but when I run it via PHP I recieve the following error:

exception 'com_exception' with message 'Source: Provider
Description: Table does not exist.' in C:\Inetpub\wwwroot\z_ADODB_test.php:41 Stack trace: #0 C:\Inetpub\wwwroot\z_ADODB_test.php(41): unknown() #1 {main}

I can provide the VBScript if necessary

Reproduce code:
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$objConnection = new COM("ADODB.Connection");
$objCommand = new COM("ADODB.Command");
$objConnection->Provider = "ADsDSOOBject";
$objConnection->Open ("Active Directory Provider");
$objCommand->ActiveConnection = $objConnection;

$objRecordset = new COM("ADODB.Recordset");

$strDNSDomain = "DC=IPS,DC=ad,DC=local";
$strFilter = "(&(objectCategory=person)(objectClass=user)(sAMAccountName=username))";
$strQuery = "<LDAP://".$strDNSDomain.">;".$strFilter.";sAMAccountName,distinguishedName,mail;subtree";

$objCommand->CommandText = $strQuery;

try{
$objRecordset = $objCommand->Execute;
}
catch (com_exception $e) {
  print "<P><B>Error executing ADODB query</B><BR>".$e . "\n";
}

Expected result:
----------------
No errors recieved.

Actual result:
--------------
exception 'com_exception' with message 'Source: Provider
Description: Table does not exist.' in C:\Inetpub\wwwroot\z_ADODB_test.php:41 Stack trace: #0 C:\Inetpub\wwwroot\z_ADODB_test.php(41): unknown() #1 {main}