Hi Marc,

Did you ever find a solution to your problem?

I have the exact same symptoms as you but cannot find what is wrong.

I've copied php4ts.dll and php_ldap.dll from my PHP install folder to WINNT/SYSTEM32 adn restarted IIS, but to no avail

As soon as you enable
extension=php_ldap.dll
in WINNT/PHP.INI and restart IIS, you get the message:
'The specified CGI application exceeded the allowed time for processing. The server has deleted the process.'

On the official site for PHP:
http://www.php.net/manual/en/ref.ldap.php
It mentions the following:

Requirements
You will need to get and compile LDAP client libraries from either the University of Michigan ldap-3.3 package, Netscape Directory SDK 3.0 or OpenLDAP to compile PHP with LDAP support.

Did anyone have to do this to get their install working?
If so, could you give me an idea of how to start the compilation please?

Thanks a lot,
Dan.