Removes the person identified by the userID parameter as a friend on the social network.
The userID parameter must be a valid user ID for the person on the social network.
If the Outlook Social Connector (OSC) provider has set doNotFollowPerson as true in the XML for capabilities, the provider must return the OSC_E_NOT_FOUND error in the case that the user ID passed in does not match a user on the network. If the provider has set doNotFollowPerson as false in capabilities, the provider should return the OSC_E_FAIL error. For information about error codes, see Outlook Social Connector Provider Error Codes.