Setting Outlook client to NTLM Authentication for RPC over HTTP

Hello, we are running Exchange 2010 on a Windows 2008 domain. When setting up new Outlook clients (via Autodiscover), RPC/HTTP is configured with Basic Authentication. Is this setting coming from the autodiscover file? How can i change it so that it defaults to NTLM? Do i need to change something on the Exchange side? thanks.
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