MS authentication with PHP Applications... WebDAV and Exchange or LDAP and Active Directory.

I am building a web application for a client I need to authenticate with their MS systems.

I originally was going to go for LDAP and AD but I have just thought of using Exchange and WebDAV.

All I need to do is authenticate and confirm that they are indeed an employee of the company and maintain a username. I would like to also use existing group policy from AD but it is not necessary as I am going to have to extend and replicate it within my application.

I will be building the application in PHP using the Zend Framework.

Can anyone guide me to which option is better (and more robust/ secure etc) and easier.
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I personally would use ldap and ad... more controll over it that way.

always been reliable for me when integrating php with AD.

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oh.. if you need any example code i should have some.
stmayesAuthor Commented:
@BrianMM... I'd really appriciate that. I have been looking at Zend_Ldap but I cannot see how groups and permissions work.
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