One of the most common questions I’m asked is if we have any resources that document the default settings for the Exchange-related virtual directories in Exchange 2007 - specifically with regards to the authentication and SSL settings. This aims to address that need should you find yourself in a situation where these settings have been inadvertently modified with the end result being an undesirable behavior in Exchange 2007. These settings hold true for both Exchange 2007 RTM and Service Pack 1.

Read more at source: http://msexchangeteam.com/archive/2008/02/01/447989.aspx