Outlook 2010 has the following Internet e-mail account configuration option in More Settings / Advanced...
"Use the following type of encrypted connection" None SSL TLS Auto.
... which allows a choice of one of None, SSL, TLS, or Auto.
The meaning of the Auto choice is unclear to me. Does Auto mean one of the two encrypted choices, SSL or TLS, must be chosen for a connection to be successful, or does it mean any of None, SSL, or TLS can be used, where Outlook may use None (clear text) if neither SSL nor TLS can be achieved?