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There is an IIS 7 webserver and PHP 5.3

I have set com.allow_dcom = true on php.ini file and restarted the webserver.

I need to use hmailserver by:

$obBaseApp = new COM("hMailServer.Application");

It says:

Fatal error: Class 'COM' not found in C:\inetpub\wwwroot\test.php on line 22

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Exact Version of PHP is 5.3.16 – Metalik Sep 1 '12 at 10:21

The php 5.4.5 build from ships the com/dotnet module as extension dll. If that's the case with your version of php too you can enable the module via


in your php.ini

Quotation from this link:

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If you are using windows 8 and Apache server and extension=php_com_dotnet.dll not worked for you then:

copy php_com_dotnet.dll file to c:/windows/system32 and write to php.ini file.

extension = c:/windows/system32/php_com_dotnet.dll

I'm using Windows 8 and Apache server for windows. Worked for me.

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