I'm trying to set up PHPWebAdmin to work with an installation of hmail.

I understand that for php version 5.3.15 / 5.4.5 and higher the COM API has been disabled as a module.
I was using PHP version 5.3.21, I went ahead upgraded to PHP 5.4.24 and added the following to my php.ini

```
    extension=php_com_dotnet.dll 

```

Before the upgrade I was seeing the following error...

> 
> Fatal error: Class 'COM' not found in C:\inetpub\wwwroot\initialize.php on line 13
> 
> 
> 

After upgrading PHP my error changes to...

Failed to create COM object `hMailServer.Application': Access is denied. 
This problem is often caused by DCOM permissions not being set.

I followed the instructions here: <https://www.hmailserver.com/documentation/latest/?page=howto_dcom_permissions>

I granted the IUSR user the DCOM permissions after checking in IIS that this is the user used for default anonymous auth, but the error persists and I am stuck for things to try next. 

Any suggestions?