The ExchangeTeam has blogged about Autodiscover and Outlook Providers configuration in two different posts, as follows:
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When, if and how do you modify Outlook Providers?
http://msexchangeteam.com/archive/2008/09/29/449921.aspx -
The Autodiscover Service and Outlook Providers – how does this stuff work?
http://msexchangeteam.com/archive/2008/09/26/449908.aspx