Seamless authentication for corporate users on an external website

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http://serverfault.com – Background: Global company with multiple locations and disparate networks and IT systems. The majority of the networks are Windows based and running Active Directory and some are connected via ADFS. Some are pure MAC networks. One location doesn't have a network or domain controller. An external website hosted on a LAMP environment (Centos 6, Apache 2.2, MySQL 5.1, PHP 5.3) acts as the company intranet. Currently users have to log in to the intranet with a different set of credentials to their domain account. Scenario: The web team want to enable users to enjoy seamless authentication s (HowTos)